20r+r+3=-18

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Solution for 20r+r+3=-18 equation: 



20r+r+3=-18

We move all terms to the left:

20r+r+3-(-18)=0

We add all the numbers together, and all the variables

21r+21=0

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

21r=-21

r=-21/21

r=-1

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