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d in (-oo:+oo)
50 = 4*d+2*d-10 // - 4*d+2*d-10
10-(4*d)-(2*d)+50 = 0
10-4*d-2*d+50 = 0
60-6*d = 0 // - 60
-6*d = -60 // : -6
d = -60/(-6)
d = 10
d = 10
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