Explain and I’ll mark as brainliest too also worth 20 points

Answer:
x = 3
Step-by-step explanation:
The equation is,
16 = 5x+1
Subtract 1 from both sides,
16-1 = 5x
15 = 5x
Divide by 5,
x = 3
Answer: X = 3 because each row had 3 1 in it and because of that each row/X would be 3.