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Simplifying 45 + 13x = 4x + 9(5 + x) 45 + 13x = 4x + (5 * 9 + x * 9) 45 + 13x = 4x + (45 + 9x) Reorder the terms: 45 + 13x = 45 + 4x + 9x Combine like terms: 4x + 9x = 13x 45 + 13x = 45 + 13x Add '-45' to each side of the equation. 45 + -45 + 13x = 45 + -45 + 13x Combine like terms: 45 + -45 = 0 0 + 13x = 45 + -45 + 13x 13x = 45 + -45 + 13x Combine like terms: 45 + -45 = 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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