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d in (-oo:+oo)
16 = (-12/5)*d // - (-12/5)*d
16-((-12/5)*d) = 0
(12/5)*d+16 = 0
12/5*d+16 = 0 // - 16
12/5*d = -16 // : 12/5
d = -16/12/5
d = -20/3
d = -20/3
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