Răspuns :
2x+[tex] \frac{x}{2} [/tex]=520
[tex] \frac{4x}{2} + \frac{x}{2} =520[/tex]
[tex] \frac{5x}{2} =520[/tex]
5x=2×520
5x=1040
x=1040÷5
x=208
[tex] \frac{4x}{2} + \frac{x}{2} =520[/tex]
[tex] \frac{5x}{2} =520[/tex]
5x=2×520
5x=1040
x=1040÷5
x=208