-18=r/4

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Solution for -18=r/4 equation: 


r in (-oo:+oo)

-18 = r/4 // - r/4

-(r/4)-18 = 0

-1/4*r-18 = 0 // + 18

-1/4*r = 18 // : -1/4

r = 18/(-1/4)

r = -72

r = -72

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