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3x-13=4(x-4)
We move all terms to the left:
3x-13-(4(x-4))=0
We calculate terms in parentheses: -(4(x-4)), so:We get rid of parentheses
4(x-4)
We multiply parentheses
4x-16
Back to the equation:
-(4x-16)
3x-4x+16-13=0
We add all the numbers together, and all the variables
-1x+3=0
We move all terms containing x to the left, all other terms to the right
-x=-3
x=-3/-1
x=+3
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