-a-3+7=a

Solution for -a-3+7=a equation:

Simplifying
-1a + -3 + 7 = a

Reorder the terms:
-3 + 7 + -1a = a

Combine like terms: -3 + 7 = 4
4 + -1a = a

Solving
4 + -1a = 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.
4 + -1a + -1a = a + -1a

Combine like terms: -1a + -1a = -2a
4 + -2a = a + -1a

Combine like terms: a + -1a = 0
4 + -2a = 0

Add '-4' to each side of the equation.
4 + -4 + -2a = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -2a = 0 + -4
-2a = 0 + -4

Combine like terms: 0 + -4 = -4
-2a = -4

Divide each side by '-2'.
a = 2

Simplifying
a = 2