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2r/6=-15
We move all terms to the left:
2r/6-(-15)=0
We add all the numbers together, and all the variables
2r/6+15=0
We multiply all the terms by the denominator
2r+15*6=0
We add all the numbers together, and all the variables
2r+90=0
We move all terms containing r to the left, all other terms to the right
2r=-90
r=-90/2
r=-45
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