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5/12x + 5/12x + 120 = x / * 12
5x + 5x + 1440 = 12x
5x + 5x - 12x = -1440
-2x = -1440 / :-2
x = 720
5/12 * 720 + 5/12 * 720 + 120 = 720
300 + 420 = 720 ;]
na 100 % dobrze, bo sprawdziłam. ;]
5x+5x+1440=12x
10x-12x= -1440
-2x= -1440 /:(-2)
x=720