a-(-a-3)=5

Solution for a-(-a-3)=5 equation:

Simplifying
a + -1(-1a + -3) = 5

Reorder the terms:
a + -1(-3 + -1a) = 5
a + (-3 * -1 + -1a * -1) = 5
a + (3 + 1a) = 5

Reorder the terms:
3 + a + 1a = 5

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

Solving
3 + 2a = 5

Solving for variable 'a'.

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

Add '-3' to each side of the equation.
3 + -3 + 2a = 5 + -3

Combine like terms: 3 + -3 = 0
0 + 2a = 5 + -3
2a = 5 + -3

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

Divide each side by '2'.
a = 1

Simplifying
a = 1