Final answer:
The solution is x = -19 / 3l.
Step-by-step explanation:
To solve the equation 3lx + 31 = 12, we need to isolate x and find its value.
Step 1: Subtract 31 from both sides of the equation:
3lx = 12 -31 = -19.
Step 2: Divide both sides of the equation by 3l:
x = -19 / 3l.
So the solution to the equation is x = -19 / 3l.