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10-r/3=-2
We move all terms to the left:
10-r/3-(-2)=0
We add all the numbers together, and all the variables
-r/3+12=0
We multiply all the terms by the denominator
-r+12*3=0
We add all the numbers together, and all the variables
-1r+36=0
We move all terms containing r to the left, all other terms to the right
-r=-36
r=-36/-1
r=+36
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