r/18=-21

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Solution for r/18=-21 equation: 


r in (-oo:+oo)

r/18 = -21 // + 21

r/18+21 = 0

1/18*r+21 = 0 // - 21

1/18*r = -21 // : 1/18

r = -21/1/18

r = -378

r = -378

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