Given: ∠ABC and ∠CBD are supplementary angles. m∠ABC = 4x + 7, m∠CBD = 2x − 1. Prove: m∠ABC = 123

How do I write this in a two column proof?

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  1. 4x+7 + 2x-1=180

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  2. What does angle CBD measure

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  3. What does angle CBD measure

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