15=-7+r.3

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Solution for 15=-7+r.3 equation: 



15=-7+r.3

We move all terms to the left:

15-(-7+r.3)=0

We add all the numbers together, and all the variables

-(r.3-7)+15=0

We get rid of parentheses

-r.3+7+15=0

We add all the numbers together, and all the variables

-r.3+22=0

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

-r.3=-22

r=-22/1

r=-22

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