Question

Решить любые три уравнения

Answer 1

$2 - 3(2x + 2) = 5 - 4x \\ 2 - 6x - 6 = 5 - 4x \\ - 6x + 4x = 5 - 2 + 6 \\ - 2x = 9 \\ x = 9 \div 2 \\ x = - 4.5 \\ \\ 5 - 2x = 11 - 7(x + 2) \\ 5 - 2x = 11 - 7x - 14 \\ - 2x + 7x = 11 - 14 - 5 \\ 5x = -8 \\ x = - \frac{8}{5} = - 1.6\\ \\ 3x + 5 + (x + 5) = (1 - x) + 4 \\ 3x + 5 + x + 5 = 1 - x + 4 \\ 5x = - 5 \\ x = - 1$