4+2.50-21.50=r

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Solution for 4+2.50-21.50=r equation: 



4+2.50-21.50=r

We move all terms to the left:

4+2.50-21.50-(r)=0

We add all the numbers together, and all the variables

-1r-15=0

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

-r=15

r=15/-1

r=-15

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