-87=-3(1-7x)

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Solution for -87=-3(1-7x) equation: 



-87=-3(1-7x)

We move all terms to the left:

-87-(-3(1-7x))=0

We add all the numbers together, and all the variables

-(-3(-7x+1))-87=0



We calculate terms in parentheses: -(-3(-7x+1)), so:

-3(-7x+1)

We multiply parentheses

21x-3

Back to the equation:

-(21x-3)



We get rid of parentheses

-21x+3-87=0

We add all the numbers together, and all the variables

-21x-84=0

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

-21x=84

x=84/-21

x=-4

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