Question

Can someone help me step by step to solve for a :
1/a + 1/2a = 1/a-3

Answer 1

Put the terms on the left over a common denominator - you can then reduce the left to 1 term.
'Cross multiply' to put the terms with 'a' onto the numerator
Expand any brackets you have.
Move all a terms to one side, and numeric to the other.
Job done

Answer 2

is it

1/a + 1/(2a) = 1/(a-3)
or
1/a + (1/2)a = (1/a)-3
?