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x-3(x+4)=13-7x
We move all terms to the left:
x-3(x+4)-(13-7x)=0
We add all the numbers together, and all the variables
x-3(x+4)-(-7x+13)=0
We multiply parentheses
x-3x-(-7x+13)-12=0
We get rid of parentheses
x-3x+7x-13-12=0
We add all the numbers together, and all the variables
5x-25=0
We move all terms containing x to the left, all other terms to the right
5x=25
x=25/5
x=5
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