Question 94892
Because if x equals zero the equation becomes:
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5*0 = 4*0
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and this reduces to:
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0 = 0
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and this is true.  (And if x is allowed to equal zero, you cannot divide both sides by
x because division by zero is not allowed.)
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So there you have an exception to what the student proposed, so the student is incorrect.
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Hope this makes sense to you.