15-13= 2
2/3-5/12= 3/12
final answer= 2 3/12
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(five and two thirds) minus (two and three fourths) = 2.91666667
negative three and two thirds
Two thirds is twelve eighteenths. Seventeen eighteenths minus twelve eighteenths is five eighteenths.
Three twelves
Two thirds is twelve eighteenths, so seventeen eighteenths minus twelve eighteenths is five eighteenths.