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x+(4x+12)+(3x+16)=180
We move all terms to the left:
x+(4x+12)+(3x+16)-(180)=0
We get rid of parentheses
x+4x+3x+12+16-180=0
We add all the numbers together, and all the variables
8x-152=0
We move all terms containing x to the left, all other terms to the right
8x=152
x=152/8
x=19
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