Answer:
b = -3
a = -0.5.
Step-by-step explanation:
As both right sides are equal to a:
12b + 3 = -2b - 4
12b + 2b = -4 - 3
14b = -7
b = -0.5.
So a = 12(-0.5) + 3 = -6 + 3
= -3.
