-87=-7+8(6+2r)

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Solution for -87=-7+8(6+2r) equation: 



-87=-7+8(6+2r)

We move all terms to the left:

-87-(-7+8(6+2r))=0

We add all the numbers together, and all the variables

-(-7+8(2r+6))-87=0



We calculate terms in parentheses: -(-7+8(2r+6)), so:

-7+8(2r+6)

determiningTheFunctionDomain
8(2r+6)-7

We multiply parentheses

16r+48-7

We add all the numbers together, and all the variables

16r+41

Back to the equation:

-(16r+41)



We get rid of parentheses

-16r-41-87=0

We add all the numbers together, and all the variables

-16r-128=0

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

-16r=128

r=128/-16

r=-8

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