2(a-1)-a=3

Solution for 2(a-1)-a=3 equation:

Simplifying
2(a + -1) + -1a = 3

Reorder the terms:
2(-1 + a) + -1a = 3
(-1 * 2 + a * 2) + -1a = 3
(-2 + 2a) + -1a = 3

Combine like terms: 2a + -1a = 1a
-2 + 1a = 3

Solving
-2 + 1a = 3

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + 1a = 3 + 2

Combine like terms: -2 + 2 = 0
0 + 1a = 3 + 2
1a = 3 + 2

Combine like terms: 3 + 2 = 5
1a = 5

Divide each side by '1'.
a = 5

Simplifying
a = 5