What is the value of x?

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x =

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true

the correct answer would be d because the slope is -2/2=1 and the y intercept is at 2 so that is the correction equation