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d in (-oo:+oo)
43 = 4*d+3*d+1 // - 4*d+3*d+1
43-(4*d)-(3*d)-1 = 0
43-4*d-3*d-1 = 0
42-7*d = 0 // - 42
-7*d = -42 // : -7
d = -42/(-7)
d = 6
d = 6
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