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4x + 100 = 180
4x = 80
x = 20
∠QPR = 3x - 5
∠QPR = 3(20) - 5
∠QPR = 55°
100+4x=180
4x=180-100
4x=80
X=80/4
X=20
<qpr =3x-5
=3×20-5
=60-5
=55