Question

Реши Уравнение...... ​

Answer 1

$7x - 5 = 3x + 7 \\ 7x - 3x = 7 + 5 \\ 4x = 12 \\ x = 3 \\ \\ 3(4x - 5) = 2(4x + 6) + 4x \\ 12x -15 = 8x + 12 + 4x \\ - 15 = 12 \\ x \in\varnothing \\ \\ 5(3x - 2) + 4x = 19 x - 10 \\ 15x - 10 + 4x = 19x - 10 \\ 15x + 4x = 19x \\ 19x=19x \\ x \in R$

Если Вы имели ввиду модуль,то...

$|4 - 2x| = |x - 9| \\ 4 - 2x = x - 9 \: \: \: \: 4 - 2x = - (x - 9) \\ -3 x = - 13 \: \: \: \: - x = 5 \\ x = \frac{13}{3} \: \: \: \: x = - 5$