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3(2x+1)=4(x-2)
6x+3=4x-8
6x-4x=-8-3
2x=-11/2
x=-5,5
b) 2/3=3x+2/2x-2
2(2x-2)=3(3x+2)
4x-4=9x+6
4x-9x=6+4
-5x=10/(-5)
x=-2
c) 6x-1/x+1=2,3/1,2
1,2=12/10 2,3=23/10
12/10(6x-1)=23/10(x+1)
72/10x-12/10=23/10x+23/10
72/10x-23/10x=23/10+12/10
49/10x=35/10
x=35/10*10/49
x=5/7
d) -x/3x-1=2x/1-6x
-x(1-6x)=2x(3x-1)
-x+6x^2=6x^2-2x
-x+2x=6x^2-6x^2
x=0
^2-czyli do kwadratu