Answer:
9f=1/2(12f-2)
simplify the equation to the form, which is simple to understand
9f=1/2(12f-2)
Reorder the terms in parentheses
9f=+(+6f-1)
Remove unnecessary parentheses
+9f=+6f-1
move all terms containing f to the left and all other terms to the right.
+9f-6f=-1
simplify left and right side of the equation.
+3f=-1
divide both sides of the equation by 3 to get f.
f=-0.33333333333333
Explanation: