54=r-12

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Solution for 54=r-12 equation: 



54=r-12

We move all terms to the left:

54-(r-12)=0

We get rid of parentheses

-r+12+54=0

We add all the numbers together, and all the variables

-1r+66=0

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

-r=-66

r=-66/-1

r=+66

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