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Simplifying 5x + 81 = 9(x + 9) + -4x Reorder the terms: 81 + 5x = 9(x + 9) + -4x Reorder the terms: 81 + 5x = 9(9 + x) + -4x 81 + 5x = (9 * 9 + x * 9) + -4x 81 + 5x = (81 + 9x) + -4x Combine like terms: 9x + -4x = 5x 81 + 5x = 81 + 5x Add '-81' to each side of the equation. 81 + -81 + 5x = 81 + -81 + 5x Combine like terms: 81 + -81 = 0 0 + 5x = 81 + -81 + 5x 5x = 81 + -81 + 5x Combine like terms: 81 + -81 = 0 5x = 0 + 5x 5x = 5x Add '-5x' to each side of the equation. 5x + -5x = 5x + -5x Combine like terms: 5x + -5x = 0 0 = 5x + -5x Combine like terms: 5x + -5x = 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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