5-r=-21

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Solution for 5-r=-21 equation: 



5-r=-21

We move all terms to the left:

5-r-(-21)=0

We add all the numbers together, and all the variables

-1r+26=0

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

-r=-26

r=-26/-1

r=+26

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