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2x-13=7(x-9)
We move all terms to the left:
2x-13-(7(x-9))=0
We calculate terms in parentheses: -(7(x-9)), so:We get rid of parentheses
7(x-9)
We multiply parentheses
7x-63
Back to the equation:
-(7x-63)
2x-7x+63-13=0
We add all the numbers together, and all the variables
-5x+50=0
We move all terms containing x to the left, all other terms to the right
-5x=-50
x=-50/-5
x=+10
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