Question

поможіть будь-ласка ​

Answer 1

1)

$\frac{x}{5} + \frac{x}{15} = \frac{2}{3} \: \: | \times 15 \\ 3x + x = 2 \times 5 \\ 4x = 10 \\ x = 10 \div 4 \\ x = 2.5$

2)

$\frac{x + 2}{4} - \frac{x}{3} = 7 \: \: | \times 12 \\ 3(x + 2) - 4x = 84 \\ 3x + 6 - 4x = 84 \\ - x = 84 - 6 \\ - x = 78 \\ x = - 78$