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13x-2(2x+3)=6
We move all terms to the left:
13x-2(2x+3)-(6)=0
We multiply parentheses
13x-4x-6-6=0
We add all the numbers together, and all the variables
9x-12=0
We move all terms containing x to the left, all other terms to the right
9x=12
x=12/9
x=1+1/3
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