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