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5x+2(87-x)=30
We move all terms to the left:
5x+2(87-x)-(30)=0
We add all the numbers together, and all the variables
5x+2(-1x+87)-30=0
We multiply parentheses
5x-2x+174-30=0
We add all the numbers together, and all the variables
3x+144=0
We move all terms containing x to the left, all other terms to the right
3x=-144
x=-144/3
x=-48
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