What is 100/56 pl can you heelp me

The transitive property of equality states that: o if a = b, then bra o if a = b, then ac = bc o if a = b and b= c, then a = if a = b and c= c, then a + b = b + c

What are the exclude value of mn+3m

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x