Question

x- x/5+x/4+2x/5 =30
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Answer 1

$x - \frac{x}{5} + \frac{x}{4} + \frac{2x}{5} = 30 \\ x - \frac{4x + 5x}{20} + \frac{2x}{5} = 30 \\ x - \frac{9x}{20} + \frac{2x}{5} = 30 \\ x - \frac{9x \times 5 + 20 \times 2x}{20 \times 5} = 30 \\ x - \frac{45x + 20x}{100} = 30 \\ x - \frac{55x}{100} = 30 \\ \frac{100x - 55x}{100} = 30 \\ 45x = 30 \\ x = \frac{30}{45} \\ x = \frac{6}{9} \\ x = \frac{2}{3}$