(9-r)+(12-r)=15

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Solution for (9-r)+(12-r)=15 equation: 



(9-r)+(12-r)=15

We move all terms to the left:

(9-r)+(12-r)-(15)=0

We add all the numbers together, and all the variables

(-1r+9)+(-1r+12)-15=0

We get rid of parentheses

-1r-1r+9+12-15=0

We add all the numbers together, and all the variables

-2r+6=0

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

-2r=-6

r=-6/-2

r=+3

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