2r+9=5r-8-4

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



2r+9=5r-8-4

We move all terms to the left:

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