5 (4 - а ) - 2 (а + 7) = 20 - 5a - 2a - 14 = 6 - 7a, де а = -4
6 - 7а = 6 - 7 * (-4) = 6 + 28 = 34.
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5 (4 - а ) - 2 (а + 7) = 20 - 5a - 2a - 14 = 6 - 7a, де а = -4
6 - 7а = 6 - 7 * (-4) = 6 + 28 = 34.