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-r/10+5=12
We move all terms to the left:
-r/10+5-(12)=0
We add all the numbers together, and all the variables
-r/10-7=0
We multiply all the terms by the denominator
-r-7*10=0
We add all the numbers together, and all the variables
-1r-70=0
We move all terms containing r to the left, all other terms to the right
-r=70
r=70/-1
r=-70
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