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Since 3 and 5 are vertical angles, we know that m3 = m5. Additionally, we know that 4 is a supplementary angle with 5, which means that the sum of their angles is 180 degrees. Therefore, we can write the equation:
m4 + m5 = 180
Since m3 = m5, we can substitute m3 for m5 in the equation:
m4 + m3 = 180