5y+10,8=21,42

Interpret using decimal comma: 5y + 10,8 = 21,42

• Subtract 10,8: 5y = 21,42 − 10,8 = 10,62
• Divide by 5: y = 10,62 / 5 = 2,124

So, y = 2,124 (which is 531/250 in fraction form).