Simplifying f(x) = 15x + -1 Multiply f * x fx = 15x + -1 Reorder the terms: fx = -1 + 15x Solving fx = -1 + 15x Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = -1x-1 + 15 Simplifying f = -1x-1 + 15 Reorder the terms: f = 15 + -1x-1