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2(x-3)-(-2x+1)=13
We move all terms to the left:
2(x-3)-(-2x+1)-(13)=0
We multiply parentheses
2x-(-2x+1)-6-13=0
We get rid of parentheses
2x+2x-1-6-13=0
We add all the numbers together, and all the variables
4x-20=0
We move all terms containing x to the left, all other terms to the right
4x=20
x=20/4
x=5
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