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2x+2(x-1)+5x+2=180
We move all terms to the left:
2x+2(x-1)+5x+2-(180)=0
We add all the numbers together, and all the variables
7x+2(x-1)-178=0
We multiply parentheses
7x+2x-2-178=0
We add all the numbers together, and all the variables
9x-180=0
We move all terms containing x to the left, all other terms to the right
9x=180
x=180/9
x=20
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