3=r+10

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Solution for 3=r+10 equation: 



3=r+10

We move all terms to the left:

3-(r+10)=0

We get rid of parentheses

-r-10+3=0

We add all the numbers together, and all the variables

-1r-7=0

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

-r=7

r=7/-1

r=-7

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