21.50-1.5=r

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Solution for 21.50-1.5=r equation: 



21.50-1.5=r

We move all terms to the left:

21.50-1.5-(r)=0

We add all the numbers together, and all the variables

-1r+20=0

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

-r=-20

r=-20/-1

r=+20

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