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it works because one of the numbers must be zero example

A*B=0 means that either A OR B is zero

2. 2(x-3)(x-1)=0

solutions are x=3 or x=1

while 2x(x-3)(x-1)=0

solutions are x=0, x=3 and x=1

The first question is about more then two numbers. How does it work then?

Number two what is different about solving them other then the solution? which steps are different?

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