21+3r=5-4r

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Solution for 21+3r=5-4r equation: 



21+3r=5-4r

We move all terms to the left:

21+3r-(5-4r)=0

We add all the numbers together, and all the variables

3r-(-4r+5)+21=0

We get rid of parentheses

3r+4r-5+21=0

We add all the numbers together, and all the variables

7r+16=0

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

7r=-16

r=-16/7

r=-2+2/7

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