[tex] \bf7 \cdot4^{9}-3 \cdot 4^{9} = [/tex]
[tex] \bf4^{9}\cdot (7 - 3)= [/tex]
[tex]\bf4^{9}\cdot 4= [/tex]
[tex]\bf4^{9 + 1}= [/tex]
[tex] \boxed{\bf4^{10}}[/tex]
