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9(x-7)=2(7-x)
We move all terms to the left:
9(x-7)-(2(7-x))=0
We add all the numbers together, and all the variables
9(x-7)-(2(-1x+7))=0
We multiply parentheses
9x-(2(-1x+7))-63=0
We calculate terms in parentheses: -(2(-1x+7)), so:We get rid of parentheses
2(-1x+7)
We multiply parentheses
-2x+14
Back to the equation:
-(-2x+14)
9x+2x-14-63=0
We add all the numbers together, and all the variables
11x-77=0
We move all terms containing x to the left, all other terms to the right
11x=77
x=77/11
x=7
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