-18=5/2r

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Solution for -18=5/2r equation: 


r in (-oo:+oo)

-18 = (5/2)*r // - (5/2)*r

-((5/2)*r)-18 = 0

(-5/2)*r-18 = 0

-5/2*r-18 = 0 // + 18

-5/2*r = 18 // : -5/2

r = 18/(-5/2)

r = -36/5

r = -36/5

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