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The common denominator of the two fractions is: 16

$ \frac{3}{4 }= \frac{(3*4)}{(4*4)} =\frac{ 12}{16} $

$ \frac{9}{16 }= \frac{(1*9)}{(1*16)} =\frac{ 9}{16} $

Fractions adjusted to a common denominator

$ \frac{3}{4 }-\frac{ 9}{16 }=\frac{ 12}{16 }-\frac{ 9}{16} $

$ \frac{12}{16 }-\frac{ 9}{16 }= \frac{(12-9)}{16} $

$ \frac{(12-9)}{16 }=\frac{ 3}{16} $

$ $

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