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d in (-oo:+oo)
14 = 5*d-7*d+6 // - 5*d-7*d+6
14-(-7*d)-(5*d)-6 = 0
7*d-5*d-6+14 = 0
2*d+8 = 0 // - 8
2*d = -8 // : 2
d = -8/2
d = -4
d = -4
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