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4+x-średni
3x-najdłurzszy
x+4+x+3x=19
5x+4=19/-4
5x=15/5
x=3
najkrótszy - x
najdłuższy - 3x
średni- x + 4
obliczanie :
x + x + 4 + 3x =19
x + x + 3x = 19 - 4
5x = 15 / : 5
x= 3