Question

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Using the figure below, Maggie used the definition of vertical angles to help her solve for x. Since vertical angles are congruent, she set the two given expressions equal to each other. After solving for x, her teacher said she got the wrong value for x. Explain where Maggie made her mistake when solving for x.​

Answer 1

Explanation:

When subtracting 7x from both sides in the first step, she said
`4x-7x=3x`, even though
`4x-7x` is actually equal to
`-3x`.