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Simplifying (x + 7) + 6 = (x + 6) + 7 Reorder the terms: (7 + x) + 6 = (x + 6) + 7 Remove parenthesis around (7 + x) 7 + x + 6 = (x + 6) + 7 Reorder the terms: 7 + 6 + x = (x + 6) + 7 Combine like terms: 7 + 6 = 13 13 + x = (x + 6) + 7 Reorder the terms: 13 + x = (6 + x) + 7 Remove parenthesis around (6 + x) 13 + x = 6 + x + 7 Reorder the terms: 13 + x = 6 + 7 + x Combine like terms: 6 + 7 = 13 13 + x = 13 + x Add '-13' to each side of the equation. 13 + -13 + x = 13 + -13 + x Combine like terms: 13 + -13 = 0 0 + x = 13 + -13 + x x = 13 + -13 + x Combine like terms: 13 + -13 = 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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