( 5x - 3 ) + ( 2x + 9 ) = 90
5x - 3 + 2x + 9 = 90
5x + 2x - 3 + 9 = 90
7x + 6 = 90
7x = 90 - 6
7x = 84
x = 84/7
x = 12
<EOF = <BOC
<EOF = 2x + 9
<EOF = 2 (12) + 9
<EOF = 24 + 9
<EOF = 33°
jawaban nya : C. 33°
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( 5x - 3 ) + ( 2x + 9 ) = 90
5x - 3 + 2x + 9 = 90
5x + 2x - 3 + 9 = 90
7x + 6 = 90
7x = 90 - 6
7x = 84
x = 84/7
x = 12
<EOF = <BOC
<EOF = 2x + 9
<EOF = 2 (12) + 9
<EOF = 24 + 9
<EOF = 33°
jawaban nya : C. 33°