-2(1,5a - 3,5) + 2,5a - 7 = -3a + 7 + 2,5a - 7 = -0,5a;
при а = -2: -0,5а = -0,5 · (-2) = 1
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-2(1,5a - 3,5) + 2,5a - 7 = -3a + 7 + 2,5a - 7 = -0,5a;
при а = -2: -0,5а = -0,5 · (-2) = 1