r/3=-9

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Solution for r/3=-9 equation: 


r in (-oo:+oo)

r/3 = -9 // + 9

r/3+9 = 0

1/3*r+9 = 0 // - 9

1/3*r = -9 // : 1/3

r = -9/1/3

r = -27

r = -27

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