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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-7x+3(-7x+1)

We multiply parentheses

-7x-21x+3

We add all the numbers together, and all the variables

-28x+3

Back to the equation:

-(-28x+3)



We get rid of parentheses

28x-3+87=0

We add all the numbers together, and all the variables

28x+84=0

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

28x=-84

x=-84/28

x=-3

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