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Simplifying f(n) = f(n + -2) + 2f Multiply f * n fn = f(n + -2) + 2f Reorder the terms: fn = f(-2 + n) + 2f fn = (-2 * f + n * f) + 2f fn = (-2f + fn) + 2f Reorder the terms: fn = -2f + 2f + fn Combine like terms: -2f + 2f = 0 fn = 0 + fn fn = fn Add '-1fn' to each side of the equation. fn + -1fn = fn + -1fn Combine like terms: fn + -1fn = 0 0 = fn + -1fn Combine like terms: fn + -1fn = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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