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A + B = 7x + 20
7x = 90 - 20 = 70
X = 70 ÷ 7 = 10
Sudut A = 50 + 5 = 55
Sudut B = 20 + 15 = 35
5x+5 + 2x+15 = 90
7x+20 = 90
7x = 90-20
7x = 70
x = 10
A = 5.10+5 = 50+5 = 55°
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