Answer:

Explanation:
The best way is to use reciprocals. Remember that the reciprocal of a number x is 1/x. For example, the reciprocal of 2 is 1/2 and the reciprocal of 13 is 1/13. Applying the reciprocal on both sides:

Another way to see it is by switching on both side numerator and denominator.
Now we divide both side by the factors next to x, which are 4 and (k+d).
