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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