3-(a-1)=x

Solution for 3-(a-1)=x equation:

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

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

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

Solving
4 + -1a = x

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + -4 + -1a = -4 + x

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

Divide each side by '-1'.
a = 4 + -1x

Simplifying
a = 4 + -1x