Posted by Stuart on Tuesday, March 1, 2011 at 7:54pm.
Please do not keep posting the same problem over and over. You try to do this one, and I'll check your work in an hour.
12-9=15d+9
3=15d+9
3-9=15d
-6=15d
15d= -6
3*5*d= -3*2 Divide with 3
5d= -2 Divide with 5
d= -2/5= -0.4
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