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5x + 15 = 180 derajat
5x = 165
x = 165/5 = 33
sudut A = (2x-3) => (2(33) - 3) => 66 - 3 = 63
2x+4x+18-3=180
6x+15=180
6x= 180-15
x= 165 : 6
x= 27,5
sudut A
(2x-3)
(2×27,5-3)
55-3=52