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=(5x+5) + (2x+15) = 90⁰
= 5x+5+2x+15 =90⁰
= 5x + 2x + 5 + 15 = 90⁰
= 7x + 20 = 90⁰
7x = 90-20
7x = 70
x = 10
besar sudut a = 5x + 5 = 5(10) + 5 = 50 + 5 = 55⁰