-20r+15r=20

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Solution for -20r+15r=20 equation: 



-20r+15r=20

We move all terms to the left:

-20r+15r-(20)=0

We add all the numbers together, and all the variables

-5r-20=0

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

-5r=20

r=20/-5

r=-4

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