1+2-3+4-a+6=5

Solution for 1+2-3+4-a+6=5 equation:

Simplifying
1 + 2 + -3 + 4 + -1a + 6 = 5

Reorder the terms:
1 + 2 + -3 + 4 + 6 + -1a = 5

Combine like terms: 1 + 2 = 3
3 + -3 + 4 + 6 + -1a = 5

Combine like terms: 3 + -3 = 0
0 + 4 + 6 + -1a = 5
4 + 6 + -1a = 5

Combine like terms: 4 + 6 = 10
10 + -1a = 5

Solving
10 + -1a = 5

Solving for variable 'a'.

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

Add '-10' to each side of the equation.
10 + -10 + -1a = 5 + -10

Combine like terms: 10 + -10 = 0
0 + -1a = 5 + -10
-1a = 5 + -10

Combine like terms: 5 + -10 = -5
-1a = -5

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

Simplifying
a = 5