Step-by-step explanation:
[tex] \frac{x}{x + x + 6} = \frac{9}{30} [/tex]
[tex] \frac{x}{2x + 6} = \frac{9}{30} [/tex]
30x = 9(2x+6)
30x = 18x+54
30x-18x = 54
12x = 54
x = 54/12
= 27/6
