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180° = (x+31)°+(2x+10)°
180° = x°+31°+2x°+10°
180° = 3x°+41°
3x° = 180°⁻ 41°
x = 139° : 3
x = 46,333
= 46,34
sudut Q = 2x+10°
= 2. 46,34+10
= 92,6+10
= 102,6