-840=-15(-7x+7)

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Solution for -840=-15(-7x+7) equation: 



-840=-15(-7x+7)

We move all terms to the left:

-840-(-15(-7x+7))=0



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

-15(-7x+7)

We multiply parentheses

105x-105

Back to the equation:

-(105x-105)



We get rid of parentheses

-105x+105-840=0

We add all the numbers together, and all the variables

-105x-735=0

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

-105x=735

x=735/-105

x=-7

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