Odpowiedzi

2010-03-14T11:15:13+01:00
7(2x-5)-[5(7x-2)-2(5x-7)]=-72
14x - 35 - [35x - 10 - 10x + 14] = -72
14x - 35 - 35x + 10 + 10x - 14 = -72
-11x = -72 + 35 - 10 + 14
-11x = -33
x = 3