Răspuns:
a)
[tex]x - 3 + 3 = 0 + 3 \\ x = 3[/tex]
b)
[tex]2x = 9 + 3 \\ 2x = 15 \\ x = 6[/tex]
c)
[tex]3x = 16 + 4 \\ 3x = 20 \\ x = \frac{20}{3} [/tex]
d)
[tex]x + 2x - 6 = 6 \\ 3x - 6 = 6 \\ 3x = 6 + 6 \\ 3x = 12 \\ x = 4[/tex]
e)
[tex]x + 4 = 4 \\ x = 0[/tex]
f)
[tex]x - 2x = - 1 \\ - x = - 1 \\ x = 1[/tex]
succes!