Question

x + x / 2 + 3 x/ 4 = 18

Answer 1

$\sf \frac{x + x}{2} + \frac{3x}{4} = 18 \\ \\\sf \frac{2x}{2} + \frac{3x }{4} = 18 \\ \\\sf x + \frac{3x}{4} = 18 \\ \\\sf 7x = 18 \times 4 \\ \\\sf 7x = 72 \\ \\\sf \red{ x = \frac{72}{7} }$