Final answer:
The correct solution for x in the given equation is -3.0380952381 after simplifying and performing algebraic operations. The provided options do not include this answer.
Step-by-step explanation:
To solve for x in the equation x + 20x + 100 = 36.2, first simplify the left side by combining like terms. This gives us 21x + 100 = 36.2. Now, we need to isolate x by performing algebraic operations. Subtract 100 from both sides to get 21x = -63.8. Then divide both sides by 21, which gives us x = -3.0380952381. None of the options given in the multiple choice (a, b, c, d) match this answer. It is possible that there might have been a mistake in the presentation of the question or the options provided.