-4r+3=21+2r

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Solution for -4r+3=21+2r equation: 



-4r+3=21+2r

We move all terms to the left:

-4r+3-(21+2r)=0

We add all the numbers together, and all the variables

-4r-(2r+21)+3=0

We get rid of parentheses

-4r-2r-21+3=0

We add all the numbers together, and all the variables

-6r-18=0

We move all terms containing r to the left, all other terms to the right

-6r=18

r=18/-6

r=-3

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