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The step that is improper is when he canceled out the (10-10) from both the numerator and denominator. The reason this is against the rules is because you are basically dividing 0 by 0. It basically does this:0*a=0*b True0/0=b/a True1=b/a ?a=b. Not necessarily trueWhich is not necessarily true since you can arbitrarily choose a and b.
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