Explicație pas cu pas:
[tex]m_a = \frac{2.(3) + x}{2} = 1.4(6) \\ 2.(3) + x = 2 \times 1.4(6) \\ x = 2 \times \frac{146 - 14}{90} - \frac{23 - 2}{9} \\ x = \frac{132}{45} - \frac{21}{9} = \frac{132 - 21 \times 5}{45} = \frac{27}{45} \\ x = \frac{3}{5} [/tex]
