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-7+r/3=-10
We move all terms to the left:
-7+r/3-(-10)=0
We add all the numbers together, and all the variables
r/3+3=0
We multiply all the terms by the denominator
r+3*3=0
We add all the numbers together, and all the variables
r+9=0
We move all terms containing r to the left, all other terms to the right
r=-9
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