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a + b = 90º (karena komplemen)
3x - 10 + x + 42 = 90
4x + 32 = 90
4x = 90 - 32
4x = 58
x =
maka, sudut a = (3x - 10)º
= (3 - 10)º
= (43,5 - 10)º
= 33,5º