-7r+9=7-9r

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Solution for -7r+9=7-9r equation: 



-7r+9=7-9r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-7r+9r-7+9=0

We add all the numbers together, and all the variables

2r+2=0

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

2r=-2

r=-2/2

r=-1

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