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5x-10 = 90
5x = 90+10
5x = 100
x = 100/5
x = 20˚ ----> sdut BOC = 2x+5 = 2.20+5 = 45˚
90 = 3x - 15 + 2x + 5
90 = 5x - 10
5x = 90 + 10
5x = 100
x = 100 : 5
x = 20
Sehingga, BOC :
( 2 × 20 + 5 )° = 45°