plz help will mark brainlest 1 hour timer and must be rigth and to or more must naswer
plz help!!!!!!!!

Answer:
Equation: -6=-6-m-7m
Solution: m= 0
Equation: -1=-5x+3+3x
Solution: x=2
Equation: 2+5x-1=21
Solution: x= 4
Hope this helps! :)