M-Theory is a conceptual framework, not something you can solve with numbers like a math problem. However, we can think of its components conceptually:

Step 1: Understand String Theory - Imagine fundamental particles are not tiny dots, but incredibly small, vibrating 'strings'. Different vibrations mean different particles (like different notes on a guitar string).
---Step 2: Recognize Five String Theories - Scientists developed five consistent versions of string theory (Type I, Type IIA, Type IIB, Heterotic SO(32), Heterotic E8xE8). Each had its own rules and features.
---Step 3: The Problem - Having five different fundamental theories felt incomplete. Physics aims for a single, unified description of nature.
---Step 4: Introducing M-Theory - Edward Witten proposed M-Theory as a framework that could unite these five string theories, showing they are different aspects of a single, more fundamental theory.
---Step 5: The 'M' stands for 'Mystery' or 'Membrane' - It suggests that besides strings, there might be higher-dimensional objects called 'branes' (like 2D membranes, 3D 'blobs', etc.) that play a role.
---Step 6: Extra Dimensions - M-Theory operates in 11 dimensions (10 space and 1 time). The extra 7 dimensions are thought to be curled up incredibly small, so we don't perceive them directly.
---Answer: M-Theory is a theoretical umbrella trying to unify all fundamental forces and particles by suggesting strings and branes exist in 11 dimensions, where the five string theories are different ways of looking at this larger picture.