-1=-9+r/21

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Solution for -1=-9+r/21 equation: 


r in (-oo:+oo)

-1 = r/21-9 // - r/21-9

9-(r/21)-1 = 0

8-1/21*r = 0 // - 8

-1/21*r = -8 // : -1/21

r = -8/(-1/21)

r = 168

r = 168

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