5r-21+3r=-7+2

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Solution for 5r-21+3r=-7+2 equation: 



5r-21+3r=-7+2

We move all terms to the left:

5r-21+3r-(-7+2)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

8r-16=0

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

8r=16

r=16/8

r=2

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