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136=8(2r+8)-7
We move all terms to the left:
136-(8(2r+8)-7)=0
We calculate terms in parentheses: -(8(2r+8)-7), so:We get rid of parentheses
8(2r+8)-7
We multiply parentheses
16r+64-7
We add all the numbers together, and all the variables
16r+57
Back to the equation:
-(16r+57)
-16r-57+136=0
We add all the numbers together, and all the variables
-16r+79=0
We move all terms containing r to the left, all other terms to the right
-16r=-79
r=-79/-16
r=4+15/16
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