To solve this equation, we need to simplify both sides and find the value of x.

Starting with the right side of the equation:
15/9 + 3/36 can be simplified by finding a common denominator. The least common multiple of 9 and 36 is 36, so we can rewrite the equation as:
15/9 + 3/36 = (15/9) * (4/4) + 3/36 = 60/36 + 3/36 = 63/36

Now, the equation becomes:
X * 2/4 = 63/36

To simplify the left side of the equation, we can divide both the numerator and denominator of 2/4 by 2:
X * (2/4) = X * (1/2) = X/2

Now, the equation becomes:
X/2 = 63/36

To solve for X, we can cross multiply:
36 * X = 2 * 63
36X = 126
X = 126/36
X = 3.5

Therefore, the value of X is 3.5.