3x+15+2x+10=180°
5x+25=180°
5x=155°
x=31°
(3x+15)+(2x+10) = 180°
5x+25 = 180°
5x = 180° - 25°
5x = 155
x = 155:5
x = 31°
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3x+15+2x+10=180°
5x+25=180°
5x=155°
x=31°
(3x+15)+(2x+10) = 180°
5x+25 = 180°
5x = 180° - 25°
5x = 155
x = 155:5
x = 31°