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1/3x-2=5-2/3x
⅓x+⅔x=5+2
x=7
b)
2/3x+2=1/2(x+9)
⅔x+2=½x+4,5
⅔x-½x=4,5-2
⅙x=2,5
x=15
c)
x-4=3(2x +5)
x-4=6x+15
x-6x=15+4
-5x=19
x=-3,8
d)
4x+2=5x-(x-1)
4x+2=5x-x+1
4x-5x+x=1-2
0=-1
liczba 3 nie spełnia żadnego równania