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X-(3-4X-7)=13
We move all terms to the left:
X-(3-4X-7)-(13)=0
We add all the numbers together, and all the variables
X-(-4X-4)-13=0
We get rid of parentheses
X+4X+4-13=0
We add all the numbers together, and all the variables
5X-9=0
We move all terms containing X to the left, all other terms to the right
5X=9
X=9/5
X=1+4/5
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