How does knowing 1 Kg is 1,000 g and 1 g is 1000 mg help you convert 1 Kg to mg

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

If 3x+8=3x+8 is it one solution or no solution

Which expression is equivalent to -5(3x - 6/7)