Answer:
[tex]\fbox{27}[/tex]
Step-by-step explanation:
[tex]4x+3=3x+9\\4x+3-3=3x+9-3\\4x=3x+6\\4x-3x=3x-3x+6\\x=6[/tex]
Plug in the 6 to the equations. Since B is the midpoint of AC, then both should be equal once plugged in [and solved].
[tex]4(6)+3\\= 27\\3(6)+9\\= 27\\\\\fbox{27}[/tex]
