Question

Быстрее, заранее спасибо. 3 уравнение и 5.

Answer 1

$3)(7.1x - 6.3) - (6.7x - 7.9) = 0 \\ 7.1x - 6.3 - 6.7x + 7.9 = 0 \\ 0.4x + 1.6 = 0 \\ 0.4x = - 1.6 \\ x = - 4 \\ 5)(1.3x - 2.5x) - (3.9x - 2.3) = 3.7 \\ ( - 1.2x) - 3.9x + 2.3 = 3.7 \\ - 1.2x - 3.9x + 2.3 = 3.7 \\ - 5.1x + 2.3 = 3.7 \\ - 5.1x = 3.7 - 2.3 \\ - 5.1x = 1.4 \\ x = - \frac{14}{51}$