Verified Answer :

pasha

180 - 168 = 12

180 - 42 - 12 = 126
2z = 126

jamiexx

z should be 63
the third angle is 180 - 168 ( adjacent angles on St line)
so the angle should be 12,
and the sum of triangle is 180,
so it should be 2z = 180 - 42 - 12
z should be 63

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