4/9 divided by 2/3 divided by 5/6 = 4/5
when you divided by two fractions, you can flip the denominator and numerator and then mutiply

Put it back into the equation,

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Well first I would subtract 7 because the seven books aren’t in the cartons, which will give you 120. Then you divide by 10 to get 12, the amount of cartons
Answer is D.
x = 0 and x = 4
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180-134=x
x=46
hope this helps :3