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