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d in (-oo:+oo)
48 = 6*d-(2*d)+8 // - 6*d-(2*d)+8
2*d-(6*d)-8+48 = 0
2*d-6*d-8+48 = 0
40-4*d = 0 // - 40
-4*d = -40 // : -4
d = -40/(-4)
d = 10
d = 10
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