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http://pl.wikipedia.org/wiki/Regu%C5%82a_Sarrusa
http://www.edukator.pl/portal-edukacyjny/rownania-i-nierownosci-liniowe-5/1390.html
W = (0,5 * 1,2 * 0,8 + 0,75 * (-4) * 0,1 + 5/3 *5,1 * (-0,4) ) - (5/3 * 1,2 * 0,1 + 0,5 * (-4) * (-0,4) + 0,75 * 5,1 * 0,8 ) = -14,08
W (x) = -72,8
W(y ) = -244,675
W(z) = -109,2
x = Wx/W
x = -72,8/ -14,08
x ≈ 5,17
y = Wy/W
y = -244,675/ - 14,08
y ≈ 17, 37
z = Wz/W
z = -109,2/-14,08
z ≈ 7,75