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d in (-oo:+oo)
(1/12)*d-((4/3)*d) = 15 // - 15
(1/12)*d-((4/3)*d)-15 = 0
(1/12)*d+(-4/3)*d-15 = 0
-5/4*d-15 = 0 // + 15
-5/4*d = 15 // : -5/4
d = 15/(-5/4)
d = -12
d = -12
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