Răspuns:
(x+1+3x):3=11
4x=32
x=8
[tex] \frac{x + 3x + 1}{3} = 11 \\ x + 3x + 1 = 11 \times 3 = x + 3 \times + 1 = 33 \\ 4 \times = 33 - 1 = 4 \times = 32 \\ x = \frac{32}{4} = \times = 8[/tex]
