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-15=r/7
We move all terms to the left:
-15-(r/7)=0
We add all the numbers together, and all the variables
-(+r/7)-15=0
We get rid of parentheses
-r/7-15=0
We multiply all the terms by the denominator
-r-15*7=0
We add all the numbers together, and all the variables
-1r-105=0
We move all terms containing r to the left, all other terms to the right
-r=105
r=105/-1
r=-105
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