80=7x-3(-6x+15)

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Solution for 80=7x-3(-6x+15) equation: 



80=7x-3(-6x+15)

We move all terms to the left:

80-(7x-3(-6x+15))=0



We calculate terms in parentheses: -(7x-3(-6x+15)), so:

7x-3(-6x+15)

We multiply parentheses

7x+18x-45

We add all the numbers together, and all the variables

25x-45

Back to the equation:

-(25x-45)



We get rid of parentheses

-25x+45+80=0

We add all the numbers together, and all the variables

-25x+125=0

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

-25x=-125

x=-125/-25

x=+5

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