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9(x-7)=-126
We move all terms to the left:
9(x-7)-(-126)=0
We add all the numbers together, and all the variables
9(x-7)+126=0
We multiply parentheses
9x-63+126=0
We add all the numbers together, and all the variables
9x+63=0
We move all terms containing x to the left, all other terms to the right
9x=-63
x=-63/9
x=-7
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