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13x-(7x-9)=15
We move all terms to the left:
13x-(7x-9)-(15)=0
We get rid of parentheses
13x-7x+9-15=0
We add all the numbers together, and all the variables
6x-6=0
We move all terms containing x to the left, all other terms to the right
6x=6
x=6/6
x=1
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