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2014-09-14T21:41:59+02:00
A=ab-bc
A= axb - bxc
A= 2x7 - 7x-5
A= 14- (-35)
A= 14 + 35
A= 49
B= a+ ac
B= a + axc
B= 2 + 2x -5
B= 2+ (-10)
B= -8