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9(x-7)=3(x-7)
We move all terms to the left:
9(x-7)-(3(x-7))=0
We multiply parentheses
9x-(3(x-7))-63=0
We calculate terms in parentheses: -(3(x-7)), so:We get rid of parentheses
3(x-7)
We multiply parentheses
3x-21
Back to the equation:
-(3x-21)
9x-3x+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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