[tex]\huge\text{Hey there!}[/tex]
[tex]\large\text{In order for you to REDUCE the FRACTION you will have to}\\\large\text{DIVIDE the NUMERATOR from the DENOMINATOR by the}\\\large\text{GCF, and it should SIMPLIFIED to the RESULT}[/tex]
[tex]\large\text{Finding your GCF (Greatest Common Factor) }\downarrow\\\large\text{21: 1, 3, \bf{7}, }\large\text{\& 21}\\\\\large\text{1, 2, 4, \bf{7}}\large\text{, 14, \& 28}\\\\\\\large\text{GCF: 7}[/tex]
[tex]\large\text{So, lets DIVIDE both your numerator and denominator by 7.}[/tex]
[tex]\bold{Equation: \dfrac{21\div7}{28\div7}}\\\\\bold{21\div7=3\leftarrow NUMERATOR}\\\bold{= \dfrac{3}{4}}\\\\\bold{28\div7=4\leftarrow DENOMINATOR}\\\\\\\boxed{{\mathsf{\dfrac{21}{28}= \dfrac{3}{4}}}}[/tex]
[tex]\\\\\boxed{\boxed{\large\text{\bf{ANSWER: }}\bold{\dfrac{3}{4}}}}\huge\checkmark[/tex]
[tex]\text{Good luck on your assignment and enjoy your day!}[/tex]
~[tex]\frak{Amphitrite1040:)}[/tex]