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9x+9=180°
9x= 171°
x= 19°
2x = 2 (19) = 38°
3x-5= 3(19) - 5 = 52°
4x+14 = 4(19) + 14 = 80°
9x + 9 = 180
9x = 180 - 9
9x = 171
x = 171 : 9
x = 19