0=-4+2r+2

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Solution for 0=-4+2r+2 equation: 



0=-4+2r+2

We move all terms to the left:

0-(-4+2r+2)=0

We add all the numbers together, and all the variables

-(2r-2)+0=0

We add all the numbers together, and all the variables

-(2r-2)=0

We get rid of parentheses

-2r+2=0

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

-2r=-2

r=-2/-2

r=1

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