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90 = 5y + 5
85 = 5y
y = 17
y-16 + 4y + 21 = 90˚
y+4y-16+21 = 90˚
5y+5 = 90˚
5y = 90-5
5y = 85 ----> y = 85:5 = 17
jadi, sudut B = 4y+21 = 4.17+21 = 68+21 = 89˚