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Step-by-step explanation:
the graphic tells us that AOB = COD.
that means
4x - 2 = 2x + 12
2x = 14
x = 7
so,
AOB = 4x - 2 = 4×7 - 2 = 28 - 2 = 26°
BOC = 5x + 15 = 5×7 + 15 = 35 + 15 = 50°
COD = 2x + 12 = 2×7 + 12 = 14 + 12 = 26° (as expected)