b(-a)+6=-27

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

Simplifying
b(-1a) + 6 = -27

Remove parenthesis around (-1a)
b * -1a + 6 = -27

Reorder the terms for easier multiplication:
-1b * a + 6 = -27

Multiply b * a
-1ab + 6 = -27

Reorder the terms:
6 + -1ab = -27

Solving
6 + -1ab = -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 + -1ab = -27 + -6

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

Combine like terms: -27 + -6 = -33
-1ab = -33

Divide each side by '-1b'.
a = 33b-1

Simplifying
a = 33b-1