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-22=10r+8
We move all terms to the left:
-22-(10r+8)=0
We get rid of parentheses
-10r-8-22=0
We add all the numbers together, and all the variables
-10r-30=0
We move all terms containing r to the left, all other terms to the right
-10r=30
r=30/-10
r=-3
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