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d in (-oo:+oo)
7-(4*d) = 39 // - 39
7-(4*d)-39 = 0
7-4*d-39 = 0
-4*d-32 = 0 // + 32
-4*d = 32 // : -4
d = 32/(-4)
d = -8
d = -8
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