21=3r-2r

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Solution for 21=3r-2r equation:



21=3r-2r
We move all terms to the left:
21-(3r-2r)=0
We add all the numbers together, and all the variables
-(+r)+21=0
We get rid of parentheses
-r+21=0
We add all the numbers together, and all the variables
-1r+21=0
We move all terms containing r to the left, all other terms to the right
-r=-21
r=-21/-1
r=+21

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