7a+6(-1-a)=27

Solution for 7a+6(-1-a)=27 equation:

Simplifying
7a + 6(-1 + -1a) = 27
7a + (-1 * 6 + -1a * 6) = 27
7a + (-6 + -6a) = 27

Reorder the terms:
-6 + 7a + -6a = 27

Combine like terms: 7a + -6a = 1a
-6 + 1a = 27

Solving
-6 + 1a = 27

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 + 1a = 27 + 6

Combine like terms: -6 + 6 = 0
0 + 1a = 27 + 6
1a = 27 + 6

Combine like terms: 27 + 6 = 33
1a = 33

Divide each side by '1'.
a = 33

Simplifying
a = 33