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Simplifying 13(x + 3) = (13x + 39) Reorder the terms: 13(3 + x) = (13x + 39) (3 * 13 + x * 13) = (13x + 39) (39 + 13x) = (13x + 39) Reorder the terms: 39 + 13x = (39 + 13x) Remove parenthesis around (39 + 13x) 39 + 13x = 39 + 13x Add '-39' to each side of the equation. 39 + -39 + 13x = 39 + -39 + 13x Combine like terms: 39 + -39 = 0 0 + 13x = 39 + -39 + 13x 13x = 39 + -39 + 13x Combine like terms: 39 + -39 = 0 13x = 0 + 13x 13x = 13x Add '-13x' to each side of the equation. 13x + -13x = 13x + -13x Combine like terms: 13x + -13x = 0 0 = 13x + -13x Combine like terms: 13x + -13x = 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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