Answer:
no the solution would be x= 20.
Step-by-step explanation:
50-x=30
-x=30-50
-x=-20
x=20
No, x=9 it's not the right solution.
Because :if x=9 the equation would be like 50-x=41 and not 30.
But in these case it's like :50-x=30
50-30=20 and not 9.
