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Simplifying -15 + 13x = 13x + -15 Reorder the terms: -15 + 13x = -15 + 13x Add '15' to each side of the equation. -15 + 15 + 13x = -15 + 15 + 13x Combine like terms: -15 + 15 = 0 0 + 13x = -15 + 15 + 13x 13x = -15 + 15 + 13x Combine like terms: -15 + 15 = 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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