Answer:
x = 2
Explanation:
We can make an equation that meets the requirements stated.
Decreased signifies subtraction, so 12 will reduce the value after it. A number can be any letter you'd like, but I'll stick to x. Since 2 is multiplying that number, we can make 2 the coefficient. Finally, set it equal to 8.
12 - 2x = 8 Subtract 12 from both sides of the equation.
-2x = -4 Divide by -2 on both sides of the equation.
x = 2