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a) 0,3x = -⅖
x=-2/5*10/3
x=-4/3
b) x + 2 - (2x - 1) = 2
x+2-2x+1=2
-x=-1
x=1
c) (1-5x)/3 = (4x - 3)/2 /*6
2-10x=12x-9
22x=11
x=1/2
d) (2x-5)/(3x + 2) = ⅔
2(3x+2)=3(2x-5)
6x+4=6x-15
sprzeczny
e) (3x + 2)² = (3x - 1)(2 + 3x)
9x²+12x+4=6x+9x²-2-3x
12x-6x+3x=-2-4
9x=-6
x=-2/3
f) 3 - 4x = -2(2x - 5)
3-4x=-4x+10
0=-7 sprzeczność
3/10x=6/10
x=6/10 : 3/10
x=2
b)x+2-2x+1=2
-x=-1
x=1
c) 1/3 - 5/3x=2x-3/2
-1 2/3x - 2x=-1/3 - 3/2
-3 2/3x=-1 5/6
x=1 (po podzieleniu)