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87+(6x+3)=180
We move all terms to the left:
87+(6x+3)-(180)=0
We add all the numbers together, and all the variables
(6x+3)-93=0
We get rid of parentheses
6x+3-93=0
We add all the numbers together, and all the variables
6x-90=0
We move all terms containing x to the left, all other terms to the right
6x=90
x=90/6
x=15
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