-a-b-3+12=

Solution for -a-b-3+12= equation:

Simplifying
-1a + -1b + -3 + 12 = 0

Reorder the terms:
-3 + 12 + -1a + -1b = 0

Combine like terms: -3 + 12 = 9
9 + -1a + -1b = 0

Solving
9 + -1a + -1b = 0

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -1a + -9 + -1b = 0 + -9

Reorder the terms:
9 + -9 + -1a + -1b = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -1a + -1b = 0 + -9
-1a + -1b = 0 + -9

Combine like terms: 0 + -9 = -9
-1a + -1b = -9

Add 'b' to each side of the equation.
-1a + -1b + b = -9 + b

Combine like terms: -1b + b = 0
-1a + 0 = -9 + b
-1a = -9 + b

Divide each side by '-1'.
a = 9 + -1b

Simplifying
a = 9 + -1b