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(r+12)/8=-2.5
We move all terms to the left:
(r+12)/8-(-2.5)=0
We add all the numbers together, and all the variables
(r+12)/8+2.5=0
We multiply all the terms by the denominator
(r+12)+(2.5)*8=0
We add all the numbers together, and all the variables
(r+12)+20=0
We get rid of parentheses
r+12+20=0
We add all the numbers together, and all the variables
r+32=0
We move all terms containing r to the left, all other terms to the right
r=-32
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