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d in (-oo:+oo)
-26 = 7*d-4*d+4 // - 7*d-4*d+4
-(-4*d)-(7*d)-26-4 = 0
4*d-7*d-26-4 = 0
-3*d-30 = 0 // + 30
-3*d = 30 // : -3
d = 30/(-3)
d = -10
d = -10
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