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r in (-oo:+oo)
-18 = 5*r+24/2 // - 5*r+24/2
-(5*r)-(24/2)-18 = 0
-5*r-18-12 = 0
-5*r-30 = 0 // + 30
-5*r = 30 // : -5
r = 30/(-5)
r = -6
r = -6
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