7= 16 + 3x
7-16 = 3x
-9 = 3x
x = (-9)/(3)
x = -3
You could turn the fraction into a decimal and then see which is bigger
I run 1 mile every 6 minutes.
My friend runs 1 mile every 7 minutes.
Lowest Common Multiple: LCM ( 6, 7 ) = 42 minutes.
Me : 42 : 6 = 7 miles
My friend : 42 : 7 = 6 miles.