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(2x+7)+x+(2x-12)=180
We move all terms to the left:
(2x+7)+x+(2x-12)-(180)=0
We add all the numbers together, and all the variables
x+(2x+7)+(2x-12)-180=0
We get rid of parentheses
x+2x+2x+7-12-180=0
We add all the numbers together, and all the variables
5x-185=0
We move all terms containing x to the left, all other terms to the right
5x=185
x=185/5
x=37
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