solve 5kx+6=7kx for x

5kx + 6 = 7kx 

 

Subtract 6 on both sides 

 

5kx + 6 - 6 = 7kx - 6

5kx = 7kx - 6

 

Then subtract 7kx on both sides

5kx - 7kx = 7kx - 6 - 7kx 

-2kx = -6 

 

Now divide by -2k on both sides

-2kx/-2k = -6/-2k

x = -6/-2k

Simplify

x = 3/k

 

The answer is D 

 

These are algebriac equations that you keep doing. Maybe try practicing the simpiler algebriac equations then slowely do more complicated ones. Just letting you know. 

 

Hope this helps ;P