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d in (-oo:+oo)
7*d-(3*d)+8 = 12 // - 12
7*d-(3*d)-12+8 = 0
7*d-3*d-12+8 = 0
4*d-4 = 0 // + 4
4*d = 4 // : 4
d = 4/4
d = 1
d = 1
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