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x * tan35 = (700-x) * tan68

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[tex]x \cdot tan35\textdegree = (700-x) \cdot tan68\textdegree[/tex]

[tex]x \cdot 0,700 =(700-x) \cdot 2,475[/tex]

[tex]0,7x = 1732,5 -2,475x[/tex]

[tex]0,7x + 2,475x = 1732,5[/tex]

[tex]3,175x = 1732,5[/tex]

[tex]x = \frac{1732,5}{3,175}[/tex]

[tex]\underline{\underline{x \approx 546}}[/tex]