Answer:
a=2/5
Step-by-step explanation:
Subtract 1/10 from both sides of the equation
1. a + 1/10 = 5/10
a + 1/10 = 12
2. a + 1/10 - 1/10 = 1/2 - 1/10
3. Subtract the numbers
a + 1/10 - 1/10 = 1/2 - 1/10
a = 1/2 - 1/10
a = 2/5
