-3=-2r+7

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Solution for -3=-2r+7 equation: 



-3=-2r+7

We move all terms to the left:

-3-(-2r+7)=0

We get rid of parentheses

2r-7-3=0

We add all the numbers together, and all the variables

2r-10=0

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

2r=10

r=10/2

r=5

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