Here is your answer:
Due to the fact that you can reduce a fraction anything are common to the two and could be divided are equal to 3/4.
Examples:
" [tex] \frac{9}{12} \neq \frac{3}{4} [/tex] ''
9/12 ÷ 3 = 3/4
" [tex] \frac{12}{15} \neq \frac{3}{4} [/tex] ''
12/15 ÷ 3 = 9/12 ÷ 3 = 3/4
Hope this helps!