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d in (-oo:+oo)
4*(2-1*d) = -40 // + 40
4*(2-1*d)+40 = 0
4*(2-d)+40 = 0
4*(2-d)+40 = 0
48-4*d = 0
48-4*d = 0
48-4*d = 0 // - 48
-4*d = -48 // : -4
d = -48/(-4)
d = 12
d = 12
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