[tex]0.5x+4=13-4x\\-9=-4.5x\\x=2[/tex]
odp D
Podstawmy sobie dwa boki do równania
[tex]13 - 4x = \frac{1}{2} x + 4 | \times 2 \\ 26 - 8x = x + 8 \\ 18 = 9x | \div 9 \\ x = 2[/tex]
[tex] \boxed{ \boxed{Odp.D}}[/tex]
