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Step-by-step explanation:
Angle 3 + Angle 5 = 180° (C-angles)
Therefore 7y + 15 + 110 - 2y = 180, 5y = 55, y = 11.
Angle 4 = Angle 5 (Z-angles)
Hence Angle 4 = 110 - 2y = 110 - 2(11) = 88°.