SOLUTION: I did this problem on a homework assignment and got it wrong it stumped me because I was trying to find a common denomonator for the multiplication. I need to know how this is sol

Question 157465: I did this problem on a homework assignment and got it wrong it stumped me because I was trying to find a common denomonator for the multiplication. I need to know how this is solved step by step if someone could take me through it please.
Multiply (-15/42)(1/8)(-21/17)(-1/17)
Answer by gonzo(654) (Show Source): You can put this solution on YOUR website!
if it's a straight multiplication which is what it looks like then you don't need to find a common denominator.
all you need to do is multiply all the numerators and multiply all the denominators and you get the answer after reducing to the simplest form.
formula as i see it is
this becomes
which becomes
the -21 on top was divided into the 42 on the bottom to become -1/2.
which then becomes

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