5r+7=21-2r

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



5r+7=21-2r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

5r+2r-21+7=0

We add all the numbers together, and all the variables

7r-14=0

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

7r=14

r=14/7

r=2

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