40=r-21

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Solution for 40=r-21 equation: 



40=r-21

We move all terms to the left:

40-(r-21)=0

We get rid of parentheses

-r+21+40=0

We add all the numbers together, and all the variables

-1r+61=0

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

-r=-61

r=-61/-1

r=+61

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