-87=3(1+5a)

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Solution for -87=3(1+5a) equation: 



-87=3(1+5a)

We move all terms to the left:

-87-(3(1+5a))=0

We add all the numbers together, and all the variables

-(3(5a+1))-87=0



We calculate terms in parentheses: -(3(5a+1)), so:

3(5a+1)

We multiply parentheses

15a+3

Back to the equation:

-(15a+3)



We get rid of parentheses

-15a-3-87=0

We add all the numbers together, and all the variables

-15a-90=0

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

-15a=90

a=90/-15

a=-6

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