80=9x-5(x-4)

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Solution for 80=9x-5(x-4) equation:



80=9x-5(x-4)
We move all terms to the left:
80-(9x-5(x-4))=0
We calculate terms in parentheses: -(9x-5(x-4)), so:
9x-5(x-4)
We multiply parentheses
9x-5x+20
We add all the numbers together, and all the variables
4x+20
Back to the equation:
-(4x+20)
We get rid of parentheses
-4x-20+80=0
We add all the numbers together, and all the variables
-4x+60=0
We move all terms containing x to the left, all other terms to the right
-4x=-60
x=-60/-4
x=+15

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