21r+15=r-85

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Solution for 21r+15=r-85 equation: 



21r+15=r-85

We move all terms to the left:

21r+15-(r-85)=0

We get rid of parentheses

21r-r+85+15=0

We add all the numbers together, and all the variables

20r+100=0

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

20r=-100

r=-100/20

r=-5

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