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d in (-oo:+oo)
(d+8)/3 = -14 // + 14
(d+8)/3+14 = 0
(d+8)/3+(3*14)/3 = 0
d+3*14+8 = 0
d+50 = 0
(d+50)/3 = 0
(d+50)/3 = 0 // * 3
d+50 = 0
d+50 = 0 // - 50
d = -50
d = -50
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