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4x+(7x+15)=180
We move all terms to the left:
4x+(7x+15)-(180)=0
We get rid of parentheses
4x+7x+15-180=0
We add all the numbers together, and all the variables
11x-165=0
We move all terms containing x to the left, all other terms to the right
11x=165
x=165/11
x=15
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