-18=r/2-6

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Solution for -18=r/2-6 equation: 


r in (-oo:+oo)

-18 = r/2-6 // - r/2-6

6-(r/2)-18 = 0

-1/2*r-12 = 0 // + 12

-1/2*r = 12 // : -1/2

r = 12/(-1/2)

r = -24

r = -24

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