42=2+r

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Solution for 42=2+r equation: 



42=2+r

We move all terms to the left:

42-(2+r)=0

We add all the numbers together, and all the variables

-(r+2)+42=0

We get rid of parentheses

-r-2+42=0

We add all the numbers together, and all the variables

-1r+40=0

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

-r=-40

r=-40/-1

r=+40

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