Question

Помогите пожалуйста! Скрин снизу.

Answer 1

$5ax = 14 - x \ 5a times 4 = 14 - 4 \ 20a = 10 \ a = 10 div 20 \ a = 0.5$

$5x - 0.4(7x - 9) = 2.94 \ 5x - 2.8x + 3.6 = 2.94 \ 2.2x = 2.94 - 3.6 \ 2.2x = - 0.66 \ x = ( - 0.66) div 2.2 \ x = - 0.3$

$- 3(2.1x - 4) - 1.9 = 1.2(0.5 - 5x) + 2.6 \ - 6.3x + 12 - 1.9 = 0.6 - 6x + 2.6 \ - 6.3 + 6x = 3.2 - 12 + 1.9 \ - 0.3x = - 6.9 \ x = - 0.69 div ( - 0.3) \ x = 23$