Question

РЕШИТЕ УРАВНЕНИЕ!!!
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Answer 1

Объяснение:

$\frac{3}{1 - x} + \frac{1}{1 + x} = \frac{28}{1 - x {}^{2} } \\ - (1 + x) \times 3 + x - 1 = - 28 \\ ( - 1 - x) \times 3 + x - 1 = - 28 \\ - 3 - 3x + x - 1 = - 28 \\ - 3 - 2x - 1 = - 28 \\ - 4 - 2x = - 28 \\ - 2x = - 28 + 4 \\ - 2x = - 24 \\ x = - 24 \div ( - 2) \\ x = 12$