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|5x + y = 8x
2y = 8x - 12 /:2
|y = 4x - 6
|5x + 4x - 6 = 8x
9x - 6 = 8x
|x = 6
|8*6 = 2y +12
48 = 2y +12
2y = 36 /:2
|y = 18
|x= 6
długość odcinka AB:
8x = 8*6 = 48
5x+y = 5*6 + 18 = 48
2y+12 = 2*18 + 12= 48