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15=-7+r.3
We move all terms to the left:
15-(-7+r.3)=0
We add all the numbers together, and all the variables
-(r.3-7)+15=0
We get rid of parentheses
-r.3+7+15=0
We add all the numbers together, and all the variables
-r.3+22=0
We move all terms containing r to the left, all other terms to the right
-r.3=-22
r=-22/1
r=-22
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