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9 i 1/3=2*(1/3x+2)+2*0,2x
28/3=2/3x+4+0,4x
28/3 - 4= 10/15x+6/15x
16/3=16/15x /:16/15
x=5
a=1/3*5+2=11/3
b=1
P=a*b
P=11/3*1
P=3 i 2/3m²