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x=pierwiastek z 18
b. 2x*=18
x*=9
x=3
c.6x*=8/5
x*=8/30
x=pierwiastek z 8/30
d.-2x*-x*=5-1
-3x*=4
x*=-4/3
(sprzecznosc)
e.-3x*=-12
x*=4
x=2
f.7x*=8
x*=8/7
x=pierwiastek z 8/7
g.4x*+8=8
4x*=0
x=0
h.5+x*=0
x*=5
x=pierwiastek z 5
i.9/2 - 3x*/6=1-2x*/2
27-3x*=3-6x*
-3x*+6x*=3-27
3x*=-24
x*=-8
(sprzecznosc)
x*- znaczy x²