3=a-3

Solution for 3=a-3 equation:

Simplifying
3 = a + -3

Reorder the terms:
3 = -3 + a

Solving
3 = -3 + 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.
3 + -1a = -3 + a + -1a

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

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

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

Combine like terms: -3 + -3 = -6
-1a = -6

Divide each side by '-1'.
a = 6

Simplifying
a = 6