4=-2r/20

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Solution for 4=-2r/20 equation: 



4=-2r/20

We move all terms to the left:

4-(-2r/20)=0

We get rid of parentheses

2r/20+4=0

We multiply all the terms by the denominator


2r+4*20=0

We add all the numbers together, and all the variables

2r+80=0

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

2r=-80

r=-80/2

r=-40

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