Решите уравнение:
а) $\frac{x}{5} - \frac{x}{2} + \frac{x}{20} = 1$;
б) $\frac{x}{2} - \frac{x}{12} = 3 - \frac{x}{3}$;
в) $\frac{x}{5} = \frac{x}{2} - \frac{x}{3} - 4$;
г) $\frac{x}{8} - \frac{x}{4} + \frac{x}{2} - x = 1$;
д) $\frac{5x}{9} - \frac{2x}{3} - x = 4$;
е) $\frac{3x}{4} - x = \frac{4x}{5} + x$.
$\frac{x}{5} - \frac{x}{2} + \frac{x}{20} = 1$ | * 20
4x − 10x + x = 20
−5x = 20
x = 20 : (−5)
x = −4
$\frac{x}{2} - \frac{x}{12} = 3 - \frac{x}{3}$ | * 12
6x − x = 36 − 4x
6x − x + 4x = 36
9x = 36
x = 36 : 9
x = 4
$\frac{x}{5} = \frac{x}{2} - \frac{x}{3} - 4$ | * 30
6x = 15x − 10x − 120
6x − 15x + 10x = −120
x = −120
$\frac{x}{8} - \frac{x}{4} + \frac{x}{2} - x = 1$ | * 8
x − 2x + 4x − 8x = 8
−5x = 8
x = 8 : (−5)
x = −1,6
$\frac{5x}{9} - \frac{2x}{3} - x = 4$ | * 9
5x − 6x − 9x = 36
−10x = 36
x = 36 : (−10)
x = −3,6
$\frac{3x}{4} - x = \frac{4x}{5} + x$ | * 20
15x − 20x = 16x + 20x
15x − 20x − 16x − 20x = 0
−41x = 0
x = 0
Пожауйста, оцените решение