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7(x+9)=2(9-x)
We move all terms to the left:
7(x+9)-(2(9-x))=0
We add all the numbers together, and all the variables
7(x+9)-(2(-1x+9))=0
We multiply parentheses
7x-(2(-1x+9))+63=0
We calculate terms in parentheses: -(2(-1x+9)), so:We get rid of parentheses
2(-1x+9)
We multiply parentheses
-2x+18
Back to the equation:
-(-2x+18)
7x+2x-18+63=0
We add all the numbers together, and all the variables
9x+45=0
We move all terms containing x to the left, all other terms to the right
9x=-45
x=-45/9
x=-5
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