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Simplifying (x + 4) + 5 = (x + 9) Reorder the terms: (4 + x) + 5 = (x + 9) Remove parenthesis around (4 + x) 4 + x + 5 = (x + 9) Reorder the terms: 4 + 5 + x = (x + 9) Combine like terms: 4 + 5 = 9 9 + x = (x + 9) Reorder the terms: 9 + x = (9 + x) Remove parenthesis around (9 + x) 9 + x = 9 + x Add '-9' to each side of the equation. 9 + -9 + x = 9 + -9 + x Combine like terms: 9 + -9 = 0 0 + x = 9 + -9 + x x = 9 + -9 + x Combine like terms: 9 + -9 = 0 x = 0 + x x = x Add '-1x' to each side of the equation. x + -1x = x + -1x Combine like terms: x + -1x = 0 0 = x + -1x Combine like terms: x + -1x = 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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