What is the value of x?

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x =

two lines slightly inclined with horizontal intersect. the left and right angles made by these lines are acute. the right acute angle is labeled left square bracket 6 left parenthesis x minus 10 right parenthesis right square bracket degrees. the left acute angle is labeled left parenthesis 3 x minus 3 right parenthesis degrees.

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality