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Please help by step by step explanation!question given that AOB is a straight line find value of unknown​

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Step-by-step EXPLANATION:

given \:  aob \: is \:  straight \: line \:  \\  \\ aob \:  + cob \:  = 180 \\  \\ (4d + 16) + (2d + 14) = 180 \\  \\ 6d  + 30 = 180 \\  \\ 6d = 150 \\ d = 25 \\  \\ d = 25 \: put \: place \: of \: d \\  \\ aoc \:  \\ 4d + 16 \\ 4 \times 25 + 16  \\ 100 + 16 = 116 \\ angle \: aoc \:  = 116 \\  \\ angle \: cob \\ 180 - 116  \\  = 64 \\ cob \:  = 64



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