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Zad.1
2x-1/x+2 = 5/3
(2x-1)3=(x+2)5
6x-3=5x+10
6x-3-5x-10=0
x-13=0
x=13
Zad.2a.
x-1, 2x, x+3
a1=x-1=1-1=0
a2=2x=2*1=2
a3=x+3=1+3=4
a2-a1=a3-a2
2x-(x-1)=(x+3)-2x
2x-x+1=x+3-2x
2x-x+1-x-3+2x=0
2x-2=0
2x=2
x=1