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2014-05-08T19:08:45+02:00
A = 3 - 15/9 × 12/5
A = 3 - 15 x 12
             9 x 5
A = 3 - 180/45
A = 3 x 45 / 1 x 45 - 180/45
A = 135/45 - 180/45
A = -45/45
A = 45 x - 1 / 45 x 1
A = - 1/1
A = - 1