Question

Срочно нужно здать сегодня

Answer 1

1)

$5(0.3x + 6) - 4(0.2x - 7) = - 5 \\ \\ 1.5x + 30 - 0.8x + 28 = - 5 \\ \\ 0.7x = - 5 - 30 - 28 \\ \\ 0.7x = - 63 \\ \\ x = - 90$

2)

$0.5(3x - 4) + 4.4 = 0.9(4x - 2) \\ \\ 1.5x - 2 + 4.4 = 3.6x - 1.8 \\ \\ 3.6x - 1.5x = - 2 + 4.4 + 1.8 \\ \\ 2.1x = 4.2 \\ \\ x = 2$