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-3r=4r-10
We move all terms to the left:
-3r-(4r-10)=0
We get rid of parentheses
-3r-4r+10=0
We add all the numbers together, and all the variables
-7r+10=0
We move all terms containing r to the left, all other terms to the right
-7r=-10
r=-10/-7
r=1+3/7
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