-84=2(-7+5r)

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Solution for -84=2(-7+5r) equation: 



-84=2(-7+5r)

We move all terms to the left:

-84-(2(-7+5r))=0

We add all the numbers together, and all the variables

-(2(5r-7))-84=0



We calculate terms in parentheses: -(2(5r-7)), so:

2(5r-7)

We multiply parentheses

10r-14

Back to the equation:

-(10r-14)



We get rid of parentheses

-10r+14-84=0

We add all the numbers together, and all the variables

-10r-70=0

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

-10r=70

r=70/-10

r=-7

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