-121=2(1+8r)+5

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Solution for -121=2(1+8r)+5 equation: 



-121=2(1+8r)+5

We move all terms to the left:

-121-(2(1+8r)+5)=0

We add all the numbers together, and all the variables

-(2(8r+1)+5)-121=0



We calculate terms in parentheses: -(2(8r+1)+5), so:

2(8r+1)+5

We multiply parentheses

16r+2+5

We add all the numbers together, and all the variables

16r+7

Back to the equation:

-(16r+7)



We get rid of parentheses

-16r-7-121=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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