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m∠s + m∠y = 90
m∠s = 90 - m∠y
m∠s= 2(m∠y) - 75
90 - m∠y = 2 m∠y -75
90 + 75 = 3 (m∠y)
165 = 3 (m∠y)
55= m∠y