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Answer:
v = 31
Step-by-step explanation:
The 2 angles are adjacent and lie on a straight line, so sum to 180° , that is
4v - 2 + 2v - 4 = 180
6v - 6 = 180 ( add 6 to both sides )
6v = 186 ( divide both sides by 6 )
v = 31