(y+5)-y=a

Solution for (y+5)-y=a equation:

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

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

Remove parenthesis around (5 + y)
5 + y + -1y = a

Combine like terms: y + -1y = 0
5 + 0 = a
5 = a

Solving
5 = a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
5 + -1a = a + -1a

Combine like terms: a + -1a = 0
5 + -1a = 0

Add '-5' to each side of the equation.
5 + -5 + -1a = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1a = 0 + -5
-1a = 0 + -5

Combine like terms: 0 + -5 = -5
-1a = -5

Divide each side by '-1'.
a = 5

Simplifying
a = 5