Решите уравнение дам 34 балла

Решите задачу:

$\frac{x - 2}{4} = \frac{3 - x}{2} + \frac{4x}{5} | \times 20 \\ 5(x - 2) = 10(3 - x) + 16x \\ 5x - 10 = 30 - 10x + 16x \\ 5x - 10 = 30 + 6x \\ 5x - 6x = 30 + 10 \\ - x = 40 \\ x = 40 \\ 4x(x + y + c) - 4y(x - y - c) - 4c(x + y - c) \\ 4x {}^{2} + 4xy + 4cx - 4xy + 4y {}^{2} + 4cy - 4cx - 4cy + 4c {}^{2} \\ 4x {}^{2} + 4y {}^{2} + 4c {}^{2}$