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6x-3(4x+7)=-63
We move all terms to the left:
6x-3(4x+7)-(-63)=0
We add all the numbers together, and all the variables
6x-3(4x+7)+63=0
We multiply parentheses
6x-12x-21+63=0
We add all the numbers together, and all the variables
-6x+42=0
We move all terms containing x to the left, all other terms to the right
-6x=-42
x=-42/-6
x=+7
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