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Simplifying f(x) = 8x + 4(5 + x) Multiply f * x fx = 8x + 4(5 + x) fx = 8x + (5 * 4 + x * 4) fx = 8x + (20 + 4x) Reorder the terms: fx = 20 + 8x + 4x Combine like terms: 8x + 4x = 12x fx = 20 + 12x Solving fx = 20 + 12x Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = 20x-1 + 12 Simplifying f = 20x-1 + 12 Reorder the terms: f = 12 + 20x-1
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