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24=r.4
We move all terms to the left:
24-(r.4)=0
We add all the numbers together, and all the variables
-(+r.4)+24=0
We get rid of parentheses
-r.4+24=0
We move all terms containing r to the left, all other terms to the right
-r.4=-24
r=-24/1
r=-24
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