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2. Because D2 is measured from the left D2= D2+.5m for the final answer.

Xcm= (m1D1+m2D2)/m1+m2

3. (.103kg*.28m+ .074kg*D2)/ (.103kg+.074kg)

I get d2=.389m +.5m= .889 m which is wrong. How am I getting the math wrong or am I doing the problem incorrectly.