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180=x+x+7+x-13
180=3x-6
186=3x
x=62
Pierwszy bok 62, drugi 69, trzeci 49.
Kąt β= 51°
Kąt γ= 71°
β=α-7°-kat II
γ=α+13°-kat III
α+α-7°+α+13°=180°
3α=174°
α=174°/3
α=58°-pierwszy
β=58°-7°=51°
γ=58°+13°=71°