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☆ RESOLUCIÓN:
[tex]2x + 2x + 42° = 90° \\ 4x + 42° = 90° \\ 4x = 90° - 42° \\ 4x = 48° \\ x = \frac{48°}{4} \\ \boxed{x = 12°}[/tex]
☆ RESPUESTA:
[tex] \boxed{x = 12°}[/tex]