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Simplifying 9x + 4(x + 1) = 13(x + 1) + -9 Reorder the terms: 9x + 4(1 + x) = 13(x + 1) + -9 9x + (1 * 4 + x * 4) = 13(x + 1) + -9 9x + (4 + 4x) = 13(x + 1) + -9 Reorder the terms: 4 + 9x + 4x = 13(x + 1) + -9 Combine like terms: 9x + 4x = 13x 4 + 13x = 13(x + 1) + -9 Reorder the terms: 4 + 13x = 13(1 + x) + -9 4 + 13x = (1 * 13 + x * 13) + -9 4 + 13x = (13 + 13x) + -9 Reorder the terms: 4 + 13x = 13 + -9 + 13x Combine like terms: 13 + -9 = 4 4 + 13x = 4 + 13x Add '-4' to each side of the equation. 4 + -4 + 13x = 4 + -4 + 13x Combine like terms: 4 + -4 = 0 0 + 13x = 4 + -4 + 13x 13x = 4 + -4 + 13x Combine like terms: 4 + -4 = 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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