Răspuns :
3 x + x / 2 + x = 45
4 x + x / 2 = 45
8 x + x = 2 × 45
9 x = 90
x = 90 : 9 ⇒ x = 10
Verific: 3 × 10 + 10 : 2 + 10 = 45
[tex]3x + x : 2 + x = 45 \\ \\ \frac{9x}{2} = 45 \\ \\ 9x = 45 \times 2 = 90 \\ \\ x = \frac{90}{9} = 10 [/tex]