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15x-63=84-7x
We move all terms to the left:
15x-63-(84-7x)=0
We add all the numbers together, and all the variables
15x-(-7x+84)-63=0
We get rid of parentheses
15x+7x-84-63=0
We add all the numbers together, and all the variables
22x-147=0
We move all terms containing x to the left, all other terms to the right
22x=147
x=147/22
x=6+15/22
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