On a test, a student was asked to solve the equation 4x + 5 = 3(x + 15). She proceeded as follows:
4x + 5 = 3x + 45 = x + 5 = 45 = x = 40
Hence, x = 40. She checked that x = 40 satisfies the original equation; however, she did not get full credit for the problem. She wants to know why. How do you respond?
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