Answer: a = -3
Explanation:
Simplifying
12 + -11a = 45
Solving
12 + -11a = 45
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '-12' to each side of the equation.
12 + -12 + -11a = 45 + -12
Combine like terms: 12 + -12 = 0
0 + -11a = 45 + -12
-11a = 45 + -12
Combine like terms: 45 + -12 = 33
-11a = 33
Divide each side by '-11'.
a = -3
Simplifying
a = -3