Solve for x: 39 - 7x = -4 (7x + 7) = 4

Subtract 39 from both sides

-7x = -4 - 39

Simplify -4 - 39 to -43

-7x = -43

Divide both sides by -7

x = -43/-7

Two negative make a positive

x = 43/7

For the second equation;

Simplify brackets

7x + 7 = 4

Subtract 7 from both sides

7x = 4 - 7

Simplify 4 - 7 to -3

7x = -3

Divide both sides by 7

x = -3/7

Simplifying

39 + -7x = -4(7x + 7) + 4

Reorder terms

39 + -7x = -4(7 + 7x) + 4

39 + -7x = (7 * -4 + 7x * -4) + 4

39 + -7x = (-28 + -28x) + 4

Reorder the terms

39 + -7x = -28 + 4 + -28x

Combine like terms -28 + 4 = -24

39 + -7x = -24 + -28x

Solving

39 + -7x = -24 + -28x

Solve for variable x                                                                                            all terms x left, all others right.

Add '28x' to each side of the equation.

39 + -7x + 28x = -24 + -28x + 28x

Combine like terms -7x + 28x = 21x

39 + 21x = -24 + -28x + 28x

Combine like terms -28x + 28x = 0

39 + 21x = -24 + 0

39 + 21x = -24

Add '-39' to each side of the equation.

39 + -39 + 21x = -24 + -39

Combine like terms: 39 + -39 = 0

0 + 21x = -24 + -39

21x = -24 + -39

Combine like terms -24 + -39 = -63

21x = -63

Divide each side by 21

x = -3

Simplifying

x = -3

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

4+3x is the answer

hope you got it