-81=3(5-4x)

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Solution for -81=3(5-4x) equation: 



-81=3(5-4x)

We move all terms to the left:

-81-(3(5-4x))=0

We add all the numbers together, and all the variables

-(3(-4x+5))-81=0



We calculate terms in parentheses: -(3(-4x+5)), so:

3(-4x+5)

We multiply parentheses

-12x+15

Back to the equation:

-(-12x+15)



We get rid of parentheses

12x-15-81=0

We add all the numbers together, and all the variables

12x-96=0

We move all terms containing x to the left, all other terms to the right

12x=96

x=96/12

x=8

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