Answer: D
Step-by-step explanation:
Mark me brainiiest.✌✌
Answer:
It means X to the variable of m.
It would look like this:

Answer:
It would be true
Step-by-step explanation:
3x-7=14, add 7 both sides, 3x=21, x=7, therefore it's true. Hope this helps!
Z=-9 I think ............