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180 = 4x + 2x + 9 + 3x
180 = 9x + 9
180-9 = 9x
171 = 9x
171 : 9 = x
19 = x
<P = 4x = 4 x 19 = 76 derajat
9x = 171
x = 19
sudut P = 19.4 = 76