9+2r=-8+5r-4

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Solution for 9+2r=-8+5r-4 equation: 



9+2r=-8+5r-4

We move all terms to the left:

9+2r-(-8+5r-4)=0

We add all the numbers together, and all the variables

2r-(5r-12)+9=0

We get rid of parentheses

2r-5r+12+9=0

We add all the numbers together, and all the variables

-3r+21=0

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

-3r=-21

r=-21/-3

r=+7

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