43=r-12

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Solution for 43=r-12 equation: 



43=r-12

We move all terms to the left:

43-(r-12)=0

We get rid of parentheses

-r+12+43=0

We add all the numbers together, and all the variables

-1r+55=0

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

-r=-55

r=-55/-1

r=+55

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