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Simplifying (x + 8) + 4 = x + (4 + 8) Reorder the terms: (8 + x) + 4 = x + (4 + 8) Remove parenthesis around (8 + x) 8 + x + 4 = x + (4 + 8) Reorder the terms: 8 + 4 + x = x + (4 + 8) Combine like terms: 8 + 4 = 12 12 + x = x + (4 + 8) Combine like terms: 4 + 8 = 12 12 + x = x + (12) 12 + x = x + 12 Reorder the terms: 12 + x = 12 + x Add '-12' to each side of the equation. 12 + -12 + x = 12 + -12 + x Combine like terms: 12 + -12 = 0 0 + x = 12 + -12 + x x = 12 + -12 + x Combine like terms: 12 + -12 = 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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