1/5(a +10 ) = -3
Not quite saseflower
at the end you had to multiply both sides by 5 not divide
An easier way would haave been to multiply both sides by 5 right at the very beginning.
That would have gotten rid of the fractions immediately :)
1/5 (a + 10) = -3
Use distributive property
1/5a + 2 = -3
Subtract 2 from both sides
1/5a = -5
Divide by 1/5 on both sides
a = 1/25