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6x+12=3x-63
We move all terms to the left:
6x+12-(3x-63)=0
We get rid of parentheses
6x-3x+63+12=0
We add all the numbers together, and all the variables
3x+75=0
We move all terms containing x to the left, all other terms to the right
3x=-75
x=-75/3
x=-25
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