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7*6= 42 | -3*-1=3 | 8*-10=-80 | 20*-7= -140
Czyli mamy=
42*(-2)-3*(-6)+(-80)-(-140)=
Wykonujemy obliczenia: 42*-2= -84 | 3*-6 = -18 zostaje:
(-84)-(-18) + (-80) - (-140) =
Obliczamy: -84 - -18 = (-66) | -80 - -140 = 60 Otrzymujemy:
(-66) + 60 = -6
Wynik to (-6)