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Actually Welcome to the concept of Angles sum property.
Since the total angle is 90° , hence we get the equation as,
==> 33° + 6x + 3° = 90°
==> 36° + 6x = 90°
==> 6x = 90 - 36
==> 6x = 54°
hence, x = 54/6 = 9°
so, we get as,
==> 6x+3 ==> 6(9)+3 = 54+3 ==> 57°
