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This video tutorial discusses the concept of change of sign as a technique to find solutions to equations, especially when they are challenging to solve directly. An example equation 2x - 7 = 0 is used to illustrate this method. By drawing the graph y = 2x - 7, the point where the graph crosses the x-axis at 3.5 is identified as the solution to the equation. This visual representation helps to understand where the solution lies in the equation.