r/2=-18

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Solution for r/2=-18 equation: 


r in (-oo:+oo)

r/2 = -18 // + 18

r/2+18 = 0

1/2*r+18 = 0 // - 18

1/2*r = -18 // : 1/2

r = -18/1/2

r = -36

r = -36

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