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Simplifying d + f = f + d Reorder the terms: d + f = d + f Add '-1d' to each side of the equation. d + -1d + f = d + -1d + f Combine like terms: d + -1d = 0 0 + f = d + -1d + f f = d + -1d + f Combine like terms: d + -1d = 0 f = 0 + f f = f Add '-1f' to each side of the equation. f + -1f = f + -1f Combine like terms: f + -1f = 0 0 = f + -1f Combine like terms: f + -1f = 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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