-4*5r=r

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Solution for -4*5r=r equation: 



-4*5r=r

We move all terms to the left:

-4*5r-(r)=0

We add all the numbers together, and all the variables

-1r-4*5r=0

Wy multiply elements

-1r-20r=0

We add all the numbers together, and all the variables

-21r=0

r=0/-21

r=0

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