What is the next logical statement in the proof below?
given: M is the midpoint of AB
prove:2(AM) = AB
AAM+AM=AB
BAM=AB-MB
CAB=AM+MB
DM (A+B)=AB
given: M is the midpoint of AB
prove:2(AM) = AB
AAM+AM=AB
BAM=AB-MB
CAB=AM+MB
DM (A+B)=AB