-7=r-3

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Solution for -7=r-3 equation: 



-7=r-3

We move all terms to the left:

-7-(r-3)=0

We get rid of parentheses

-r+3-7=0

We add all the numbers together, and all the variables

-1r-4=0

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

-r=4

r=4/-1

r=-4

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