20r-5r=-15

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Solution for 20r-5r=-15 equation: 



20r-5r=-15

We move all terms to the left:

20r-5r-(-15)=0

We add all the numbers together, and all the variables

15r+15=0

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

15r=-15

r=-15/15

r=-1

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