7-(3-a)=

Solution for 7-(3-a)= equation:

Simplifying
7 + -1(3 + -1a) = 0
7 + (3 * -1 + -1a * -1) = 0
7 + (-3 + 1a) = 0

Combine like terms: 7 + -3 = 4
4 + 1a = 0

Solving
4 + 1a = 0

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 = 0 + -4

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

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

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

Simplifying
a = -4