21r-7-r-5=-52

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Solution for 21r-7-r-5=-52 equation: 



21r-7-r-5=-52

We move all terms to the left:

21r-7-r-5-(-52)=0

We add all the numbers together, and all the variables

20r+40=0

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

20r=-40

r=-40/20

r=-2

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