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Simplifying f(x) = -1x3 + 4x2 + 21x Multiply f * x fx = -1x3 + 4x2 + 21x Reorder the terms: fx = 21x + 4x2 + -1x3 Solving fx = 21x + 4x2 + -1x3 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = 21 + 4x + -1x2 Simplifying f = 21 + 4x + -1x2
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