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d in (-oo:+oo)
-(4*d)-2 = 2*d-50 // - 2*d-50
50-(4*d)-(2*d)-2 = 0
50-4*d-2*d-2 = 0
48-6*d = 0 // - 48
-6*d = -48 // : -6
d = -48/(-6)
d = 8
d = 8
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