Three more than twice the sum of 7 and a number is 25. find the number

Make an equation for this problem:

2(7 + x) + 3 = 25

Twice the sum of 7 and a number: 2(7 + x)

Three more than: + 3

is 25: = 25

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Solve the equation by distributing 2 inside the parentheses.

14 + 2x + 3 = 25

Combine like terms.

17 + 2x = 25

Subtract 17 from both sides.

2x = 8

Divide both sides by 2.

x = 4

The number is 4.

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2