-12-3(5-b)=0

Solution for -12-3(5-b)=0 equation:

Simplifying
-12 + -3(5 + -1b) = 0
-12 + (5 * -3 + -1b * -3) = 0
-12 + (-15 + 3b) = 0

Combine like terms: -12 + -15 = -27
-27 + 3b = 0

Solving
-27 + 3b = 0

Solving for variable 'b'.

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

Add '27' to each side of the equation.
-27 + 27 + 3b = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 3b = 0 + 27
3b = 0 + 27

Combine like terms: 0 + 27 = 27
3b = 27

Divide each side by '3'.
b = 9

Simplifying
b = 9