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-22=-4r-10
We move all terms to the left:
-22-(-4r-10)=0
We get rid of parentheses
4r+10-22=0
We add all the numbers together, and all the variables
4r-12=0
We move all terms containing r to the left, all other terms to the right
4r=12
r=12/4
r=3
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