9r+(-2r)+7=49

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Solution for 9r+(-2r)+7=49 equation: 



9r+(-2r)+7=49

We move all terms to the left:

9r+(-2r)+7-(49)=0

We add all the numbers together, and all the variables

9r+(-2r)-42=0

We get rid of parentheses

9r-2r-42=0

We add all the numbers together, and all the variables

7r-42=0

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

7r=42

r=42/7

r=6

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