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r/10+3=-2
We move all terms to the left:
r/10+3-(-2)=0
We add all the numbers together, and all the variables
r/10+5=0
We multiply all the terms by the denominator
r+5*10=0
We add all the numbers together, and all the variables
r+50=0
We move all terms containing r to the left, all other terms to the right
r=-50
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