-87=-3(7r-6)

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Solution for -87=-3(7r-6) equation: 



-87=-3(7r-6)

We move all terms to the left:

-87-(-3(7r-6))=0



We calculate terms in parentheses: -(-3(7r-6)), so:

-3(7r-6)

We multiply parentheses

-21r+18

Back to the equation:

-(-21r+18)



We get rid of parentheses

21r-18-87=0

We add all the numbers together, and all the variables

21r-105=0

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

21r=105

r=105/21

r=5

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