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4x + [tex] \frac{x}{4} + \frac{x}{4} [/tex] = 360°

Răspuns :

[tex]4x+\frac{x}{4}+\frac{x}{4}=360|*4\\ 16x+x+x=1440\\ 18x=1440=\ \textgreater \ x=80[/tex]