1.2x-7=1.3(x-12) how do you solve this equation

x = 86.

Step-by-step explanation:

Solve for x:

1.2 x - 7 = 1.3 (x - 12)

Expand out terms of the right hand side:

1.2 x - 7 = 1.3 x - 15.6

Subtract 1.3 x from both sides:

(1.2 x - 1.3 x) - 7 = (1.3 x - 1.3 x) - 15.6

1.2 x - 1.3 x = -0.1 x:

-0.1 x - 7 = (1.3 x - 1.3 x) - 15.6

1.3 x - 1.3 x = 0:

-0.1 x - 7 = -15.6

Add 7 to both sides:

(7 - 7) - 0.1 x = 7 - 15.6

7 - 7 = 0:

-0.1 x = 7 - 15.6

7 - 15.6 = -8.6:

-0.1 x = -8.6

Divide both sides of -0.1 x = -8.6 by -0.1:

(-0.1 x)/(-0.1) = (-8.6)/(-0.1)

(-0.1)/(-0.1) = 1:

x = (-8.6)/(-0.1)

(-8.6)/(-0.1) = 86.:

x = 86.

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: