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13x-11=9x-7
We move all terms to the left:
13x-11-(9x-7)=0
We get rid of parentheses
13x-9x+7-11=0
We add all the numbers together, and all the variables
4x-4=0
We move all terms containing x to the left, all other terms to the right
4x=4
x=4/4
x=1
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