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13x-63=2(2x-9)
We move all terms to the left:
13x-63-(2(2x-9))=0
We calculate terms in parentheses: -(2(2x-9)), so:We get rid of parentheses
2(2x-9)
We multiply parentheses
4x-18
Back to the equation:
-(4x-18)
13x-4x+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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