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13x-2(3x-4)=1
We move all terms to the left:
13x-2(3x-4)-(1)=0
We multiply parentheses
13x-6x+8-1=0
We add all the numbers together, and all the variables
7x+7=0
We move all terms containing x to the left, all other terms to the right
7x=-7
x=-7/7
x=-1
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