Question

Решите пожалуйста уравнение

Answer 1

$1)4x + 3x = 5 + 2x \\ 7x - 5 - 2x = 0 \\ 5x - 5 = 0 \\ 5x = 0 + 5 = 5 \\ x = 5 \div 5 = 1$
$2)4x + 5x = 10x - 5 \\ 9x - 10x + 5 = 0 \\ - x + 5 = 0 \\ - x = - 5 \\ x = 5$
$3)5x - x = 3x + 10 \\ 4x - 3x - 10 = 0 \\ x - 10 = 0 \\ x = 10$
$4)3x - 4x = 6x - 21 \\ - x - 6x + 21 = 0 \\ - 7x + 21 = 0 \\ x = 3$