2x + 3x + 3x + 12 = 180° [Sum of all angles of a triangle is 180°]
=> 7 x = 180° - 12°
=> 7 x = 168°
=> x = [tex]\frac{168}{7}[/tex]°
=> x = 24°
[tex]\\[/tex]
? = 2x + 3x
=> 2×24° + 3×24°
=> 48° + 72°
=> 120°
[tex]\\\\\\[/tex]
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