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(2x+7)+5x+12=180
We move all terms to the left:
(2x+7)+5x+12-(180)=0
We add all the numbers together, and all the variables
5x+(2x+7)-168=0
We get rid of parentheses
5x+2x+7-168=0
We add all the numbers together, and all the variables
7x-161=0
We move all terms containing x to the left, all other terms to the right
7x=161
x=161/7
x=23
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