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10=-7r+5r
We move all terms to the left:
10-(-7r+5r)=0
We add all the numbers together, and all the variables
-(-2r)+10=0
We get rid of parentheses
2r+10=0
We move all terms containing r to the left, all other terms to the right
2r=-10
r=-10/2
r=-5
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