Answer:
All real numbers
Step-by-step explanation:
5y + 4 = 5(y + 5) – 21
~Simpify right side
5y + 4 = 5y + 25 - 21
5y + 4 = 5y + 4
~Subtract 4 to both sides
5y = 5y
~Divide 5 to both sides
0 = 0
Best of Luck!
