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Welcome to friendly Math 101! Today's lesson is on how to check your answers when solving equations. To ensure correctness, substitute the solution back into the equation to create a true statement. For example, if x equals -3, substitute to get -3 * -3 + 4 = 13, which is true. However, if the solution is incorrect, it will create a false statement. For instance, if a equals 8 in a multi-step equation, substituting gives a false statement, indicating an incorrect solution. Always check your answers to ensure accuracy.