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3x + 2x + x + 15 = 180
6x + 15 = 180
6x = 180-15
6x = 165
x = 165/6
x = 27,5
A = 2x
= 2(27,5)
= 55° (A.)
6×=180-15
×=165÷6=27.5
《A.2×27.5
=55°