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Verified answer
1/2(jedna druga) [xy (x−0, 2)] + xy - [xy -7(x + y)] =0,5[xy-x+0,2]+ xy-0,25 [xy-7x-7y] = =
0,5xy -0,5x+0,1+xy - 0, 25xy+1, 75x + 1.
1, 25x+1, 25x+1, 75y +0,1