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6-21+2-12-21=-46
b)(6a-8b -0,7) -(6,9+a-5b)+1,8= dla a=0,21 b=0,1
(1,26-0,8-0,7)-6,9-0,21+0,5+1,8=-5,05
c)½abc-(4ab+2abc) + (-bc + 5ab)= dla a=-2 b=½ c=-4
2+4-8+2-5=-5