Simplifying fx = 5x + -45 Reorder the terms: fx = -45 + 5x Solving fx = -45 + 5x Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = -45x-1 + 5 Simplifying f = -45x-1 + 5 Reorder the terms: f = 5 + -45x-1