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Simplifying 13x + 15 = 13x + -15 Reorder the terms: 15 + 13x = 13x + -15 Reorder the terms: 15 + 13x = -15 + 13x Add '-13x' to each side of the equation. 15 + 13x + -13x = -15 + 13x + -13x Combine like terms: 13x + -13x = 0 15 + 0 = -15 + 13x + -13x 15 = -15 + 13x + -13x Combine like terms: 13x + -13x = 0 15 = -15 + 0 15 = -15 Solving 15 = -15 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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