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8(1+3r)=136
We move all terms to the left:
8(1+3r)-(136)=0
We add all the numbers together, and all the variables
8(3r+1)-136=0
We multiply parentheses
24r+8-136=0
We add all the numbers together, and all the variables
24r-128=0
We move all terms containing r to the left, all other terms to the right
24r=128
r=128/24
r=5+1/3
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