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r in (-oo:+oo)
14 = (3*r)/1.5 // - (3*r)/1.5
14-((3*r)/1.5) = 0
14-2*r = 0
14-2*r = 0 // - 14
-2*r = -14 // : -2
r = -14/(-2)
r = 7
r = 7
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