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d in (-oo:+oo)
103 = 4*d+6*d+3 // - 4*d+6*d+3
103-(4*d)-(6*d)-3 = 0
103-4*d-6*d-3 = 0
100-10*d = 0 // - 100
-10*d = -100 // : -10
d = -100/(-10)
d = 10
d = 10
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