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13x-9=7x+3
We move all terms to the left:
13x-9-(7x+3)=0
We get rid of parentheses
13x-7x-3-9=0
We add all the numbers together, and all the variables
6x-12=0
We move all terms containing x to the left, all other terms to the right
6x=12
x=12/6
x=2
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