2/3 times (-2 1/4)times 3/4
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(-2/3)*(-2 1/4)*(3/4)   Convert the mixed fraction to improper fraction.
(-2/3)*(-9/4)*(3/4)   Then you multiply the numerators with numerators and                                             denominators with denominators

(-2*-9*3)           negative times negative is positive, so the negative sign is gone
   
(3*4*4*)              The lines () is the line of the fraction 

54/48            This is the product of this multiplication, now you need to simplify 
                        by reducing the numbers of the fraction

9/8         And that would be the answer