Question

Найдите корень уравнений.

Answer 1

$\frac{2 - 7y}{6} + \frac{4y + 7}{3} = - \frac{y}{2} | \times 6 \\ 2 - 7y + 2(4y + 7) = - 3y \\ 2 - 7y + 8y + 14 = - 3y \\ 16 + y = - 3y \\ y + 3y = - 16 \\ 4y = - 16 \\ y = - 4 \\ \frac{7y - 1}{12} - \frac{y + 1}{4} = \frac{2y + 5}{ 3} | \times 12 \\ 7y - 1 - 3(y + 1) = 4(2y + 5) \\ 7y1 - 3y - 3 = 8y + 20 \\ 4y - 4 = 8y + 20 \\ 4y - 8y = 20 + 4 \\ - 4y = 24 \\ y = - 6$