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Simplifying 4 + (d + e) = (4 + d) + e Remove parenthesis around (d + e) 4 + d + e = (4 + d) + e Remove parenthesis around (4 + d) 4 + d + e = 4 + d + e Add '-4' to each side of the equation. 4 + d + -4 + e = 4 + d + -4 + e Reorder the terms: 4 + -4 + d + e = 4 + d + -4 + e Combine like terms: 4 + -4 = 0 0 + d + e = 4 + d + -4 + e d + e = 4 + d + -4 + e Reorder the terms: d + e = 4 + -4 + d + e Combine like terms: 4 + -4 = 0 d + e = 0 + d + e d + e = d + e Add '-1d' to each side of the equation. d + -1d + e = d + -1d + e Combine like terms: d + -1d = 0 0 + e = d + -1d + e e = d + -1d + e Combine like terms: d + -1d = 0 e = 0 + e e = e Add '-1e' to each side of the equation. e + -1e = e + -1e Combine like terms: e + -1e = 0 0 = e + -1e Combine like terms: e + -1e = 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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