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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