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4x+(7x+12)=180
We move all terms to the left:
4x+(7x+12)-(180)=0
We get rid of parentheses
4x+7x+12-180=0
We add all the numbers together, and all the variables
11x-168=0
We move all terms containing x to the left, all other terms to the right
11x=168
x=168/11
x=15+3/11
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