8=-r-+4

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Solution for 8=-r-+4 equation: 



8=-r-+4

We move all terms to the left:

8-(-r-+4)=0

We add all the numbers together, and all the variables

-(-1r)+8=0

We get rid of parentheses

1r+8=0

We add all the numbers together, and all the variables

r+8=0

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

r=-8

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