15r-20r+(-1)=19

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Solution for 15r-20r+(-1)=19 equation: 



15r-20r+(-1)=19

We move all terms to the left:

15r-20r+(-1)-(19)=0

determiningTheFunctionDomain
15r-20r-19+(-1)=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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