notes/mat/Zlomky.md
2021-09-11 17:54:20 +02:00

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$$
\frac{x}{3} - 20 = \frac{x}{7}
$$
$$
7x - 420 = 3x
$$
$$
4x - 420 = 0
$$
$$
4x = 420
$$
$$
x = 105
$$
$$
\frac{x}{5} + \frac{x}{3} + \frac{2x}{9} + \frac{x}{6} = \frac{18x}{90} + \frac{30x}{90} + \frac{20x}{90} + \frac{15x}{90} = \frac{83x}{90}
$$