28=8-2r-4

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Solution for 28=8-2r-4 equation: 



28=8-2r-4

We move all terms to the left:

28-(8-2r-4)=0

We add all the numbers together, and all the variables

-(-2r+4)+28=0

We get rid of parentheses

2r-4+28=0

We add all the numbers together, and all the variables

2r+24=0

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

2r=-24

r=-24/2

r=-12

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