r+9=r+16-7

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Solution for r+9=r+16-7 equation: 



r+9=r+16-7

We move all terms to the left:

r+9-(r+16-7)=0

We add all the numbers together, and all the variables

r-(r+9)+9=0

We get rid of parentheses

r-r-9+9=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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