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4x - 22 + 90 + 3x = 180
7x + 68 = 180
7x = 180 - 68
7x = 112
x = 112 : 7
x = 16°
b. ∠POS + ∠SOR + ∠QOR = 180°
3y - 15 + 4y + 2y - 9 = 180
9y - 24 = 180
9y = 180 + 24
9y = 204
y = 204 : 9
y = 22,67°