75=12+9r

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Solution for 75=12+9r equation: 



75=12+9r

We move all terms to the left:

75-(12+9r)=0

We add all the numbers together, and all the variables

-(9r+12)+75=0

We get rid of parentheses

-9r-12+75=0

We add all the numbers together, and all the variables

-9r+63=0

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

-9r=-63

r=-63/-9

r=+7

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