-r+4-2r=19

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Solution for -r+4-2r=19 equation: 



-r+4-2r=19

We move all terms to the left:

-r+4-2r-(19)=0

We add all the numbers together, and all the variables

-3r-15=0

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

-3r=15

r=15/-3

r=-5

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