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Simplifying x + (x + 4) = x + x + 4 Reorder the terms: x + (4 + x) = x + x + 4 Remove parenthesis around (4 + x) x + 4 + x = x + x + 4 Reorder the terms: 4 + x + x = x + x + 4 Combine like terms: x + x = 2x 4 + 2x = x + x + 4 Reorder the terms: 4 + 2x = 4 + x + x Combine like terms: x + x = 2x 4 + 2x = 4 + 2x Add '-4' to each side of the equation. 4 + -4 + 2x = 4 + -4 + 2x Combine like terms: 4 + -4 = 0 0 + 2x = 4 + -4 + 2x 2x = 4 + -4 + 2x Combine like terms: 4 + -4 = 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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