15r-3r+5=21-4r

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Solution for 15r-3r+5=21-4r equation: 



15r-3r+5=21-4r

We move all terms to the left:

15r-3r+5-(21-4r)=0

We add all the numbers together, and all the variables

15r-3r-(-4r+21)+5=0

We add all the numbers together, and all the variables

12r-(-4r+21)+5=0

We get rid of parentheses

12r+4r-21+5=0

We add all the numbers together, and all the variables

16r-16=0

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

16r=16

r=16/16

r=1

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