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Simplifying (x + -7) + 7 = (x + 7) + -7 Reorder the terms: (-7 + x) + 7 = (x + 7) + -7 Remove parenthesis around (-7 + x) -7 + x + 7 = (x + 7) + -7 Reorder the terms: -7 + 7 + x = (x + 7) + -7 Combine like terms: -7 + 7 = 0 0 + x = (x + 7) + -7 x = (x + 7) + -7 Reorder the terms: x = (7 + x) + -7 Remove parenthesis around (7 + x) x = 7 + x + -7 Reorder the terms: x = 7 + -7 + x Combine like terms: 7 + -7 = 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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