Question

x+x/2 = 21/2

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

x+9/7 - x/2 = 2

Answer 1

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

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