-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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