To find \( m∠7 \) when \( m∠6 = 140° \), it depends on the context of the problem (e.g., whether these angles are vertical angles, supplementary angles, etc.).
If \( m∠6 \) and \( m∠7 \) represent supplementary angles (which add up to 180°), then:
\[ m∠7 + m∠6 = 180° \] \[ m∠7 + 140° = 180° \] \[ m∠7 = 180° - 140° = 40° \]
If they are not supplementary or have another relationship, please provide additional context.
Based on the assumption that they are supplementary, the answer is:
40°