r/2=-9

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Solution for r/2=-9 equation: 


r in (-oo:+oo)

r/2 = -9 // + 9

r/2+9 = 0

1/2*r+9 = 0 // - 9

1/2*r = -9 // : 1/2

r = -9/1/2

r = -18

r = -18

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