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-22=-10+r
We move all terms to the left:
-22-(-10+r)=0
We add all the numbers together, and all the variables
-(r-10)-22=0
We get rid of parentheses
-r+10-22=0
We add all the numbers together, and all the variables
-1r-12=0
We move all terms containing r to the left, all other terms to the right
-r=12
r=12/-1
r=-12
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