Question

x+x/2 = 21/2

x/2+x/9+x= -29/2

x+9/7 - x/2 = 2

Answer 1

$\frac{x}{2} + \frac{x}{9} + x = \frac{ - 29}{2} \\ 9x + 2x + 18x = - 261 \\ 29x = 261 \\ x = 9$
$x + \frac{9}{7} - \frac{x}{2} = 2 \\ 14x + 18 - 7x = 28 \\ 7x = 10 \\ x = \frac{10}{7}$

$x + \frac{x}{2} = \frac{21}{2} \\ 2x + x = 21 \\ 3x = 21 \\ x = 7$