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3x7 -4x5 = 21-20=1
6x(2+7)=6x9 =54
10x6 +12:3 = 60 + 4 =64
100- 2x(13-7) = 100-2x6 =100-12=88
najpierw to co w nawiasach, potem mnożenie i dzielenie, potem dodawanie i odejmowanie.