martaw7 wrote:-7yt over 3x = ? over 18xyt
I will guess that the original equation is as follows:. . . . .
...and that the instructions were something along the lines of "Find the expression which makes the two fractions similar." If so, then:
Find the value by which 3x was multiplied, in order to get 18xyt, and multiply -7yt by the same value.