3a-(1-a)+7=

Solution for 3a-(1-a)+7= equation:

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

Reorder the terms:
-1 + 7 + 3a + 1a = 0

Combine like terms: -1 + 7 = 6
6 + 3a + 1a = 0

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

Solving
6 + 4a = 0

Solving for variable 'a'.

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

Add '-6' to each side of the equation.
6 + -6 + 4a = 0 + -6

Combine like terms: 6 + -6 = 0
0 + 4a = 0 + -6
4a = 0 + -6

Combine like terms: 0 + -6 = -6
4a = -6

Divide each side by '4'.
a = -1.5

Simplifying
a = -1.5