(2,5a+3b-2,5)-(0,5a-1,5b+2,5)=
2,5a + 3b - 2,5 - 0,5a + 1,5 b - 2,5 = 2a + 4,5b - 5 = 0,5(4a + 9b - 10)
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2,5a + 3b - 2,5 - 0,5a + 1,5 b - 2,5 = 2a + 4,5b - 5 = 0,5(4a + 9b - 10)