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-10+r=-4r
We move all terms to the left:
-10+r-(-4r)=0
We get rid of parentheses
r+4r-10=0
We add all the numbers together, and all the variables
5r-10=0
We move all terms containing r to the left, all other terms to the right
5r=10
r=10/5
r=2
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