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In this question :

180 - z =w

x +y + z= 180

x = 180 - y - z

Step 1: m∠x + m∠y + m∠z = 180 degrees (sum of angles of a triangle)Step 2: m∠w − m∠z = 90 degrees (corresponding angles)Step 3: Therefore, m∠x + m∠y + m∠z = m∠w + m∠zStep 4: So, m∠x + m∠y = m∠wIn which step did the student first make a mistake and how can it be corrected?

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