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8(2r-5)=11
We move all terms to the left:
8(2r-5)-(11)=0
We multiply parentheses
16r-40-11=0
We add all the numbers together, and all the variables
16r-51=0
We move all terms containing r to the left, all other terms to the right
16r=51
r=51/16
r=3+3/16
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