if B is the mid point the two sides have to be equal
4x+3 = 3x+9
subtract 3x from each side
x+3 = 9
subtract 3 from each side
x=6
To find AC add 4x+3 and 3x+9
4x+3+3x+9
7x+12
7(6)+12
42+12
54
Choice D
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