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-10ab+5a+27ab-6b-a+2b =
17ab+4a-4b
2,5x(4y-z) - 4,5y(2x - z) + 3,5z(5y-2x) =
10xy-2,5xz-9xy+4,5yz+17,5yz-7xz =
xy-9,5xz+22yz
2) 2,5x(4y-z) - 4,5y(2x - z) + 3,5z(5y-2x) = 10xy-2,5xz-9xy+4,5zy+17,5zy-7xz= xy - 9,5xz + 22zy