7=10+r+2

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Solution for 7=10+r+2 equation: 



7=10+r+2

We move all terms to the left:

7-(10+r+2)=0

We add all the numbers together, and all the variables

-(r+12)+7=0

We get rid of parentheses

-r-12+7=0

We add all the numbers together, and all the variables

-1r-5=0

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

-r=5

r=5/-1

r=-5

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