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13x-(4x-7)=16
We move all terms to the left:
13x-(4x-7)-(16)=0
We get rid of parentheses
13x-4x+7-16=0
We add all the numbers together, and all the variables
9x-9=0
We move all terms containing x to the left, all other terms to the right
9x=9
x=9/9
x=1
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