Answer: C. -3y+14
Step-by-step explanation:

Move 3y to ther right side.

So the answer is C. Because x = -3y+14.
As an equation, we have:
69+42=5+(146-x)
You just have to simplify:
111=5+(146-x)
106=146-x
-40=-x
40=x
Your unknown number is 40
We have:

Then we use trigonometric identities to change the negative sign of the trigonometric functions, so:

We clear f(x):

we simply what we can:

Thus, the correct answer is;
The correct answer ids 100% answer choice D