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Simplifying (x + 7) + x = x + (7 + x) Reorder the terms: (7 + x) + x = x + (7 + x) Remove parenthesis around (7 + x) 7 + x + x = x + (7 + x) Combine like terms: x + x = 2x 7 + 2x = x + (7 + x) Remove parenthesis around (7 + x) 7 + 2x = x + 7 + x Reorder the terms: 7 + 2x = 7 + x + x Combine like terms: x + x = 2x 7 + 2x = 7 + 2x Add '-7' to each side of the equation. 7 + -7 + 2x = 7 + -7 + 2x Combine like terms: 7 + -7 = 0 0 + 2x = 7 + -7 + 2x 2x = 7 + -7 + 2x Combine like terms: 7 + -7 = 0 2x = 0 + 2x 2x = 2x Add '-2x' to each side of the equation. 2x + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 0 = 2x + -2x Combine like terms: 2x + -2x = 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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