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0=-18+4r+6
We move all terms to the left:
0-(-18+4r+6)=0
We add all the numbers together, and all the variables
-(4r-12)+0=0
We add all the numbers together, and all the variables
-(4r-12)=0
We get rid of parentheses
-4r+12=0
We move all terms containing r to the left, all other terms to the right
-4r=-12
r=-12/-4
r=+3
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