(78-r)=12

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Solution for (78-r)=12 equation: 



(78-r)=12

We move all terms to the left:

(78-r)-(12)=0

We add all the numbers together, and all the variables

(-1r+78)-12=0

We get rid of parentheses

-1r+78-12=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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