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Simplifying (3x + 5) + 7 = 7 + (3x + 5) Reorder the terms: (5 + 3x) + 7 = 7 + (3x + 5) Remove parenthesis around (5 + 3x) 5 + 3x + 7 = 7 + (3x + 5) Reorder the terms: 5 + 7 + 3x = 7 + (3x + 5) Combine like terms: 5 + 7 = 12 12 + 3x = 7 + (3x + 5) Reorder the terms: 12 + 3x = 7 + (5 + 3x) Remove parenthesis around (5 + 3x) 12 + 3x = 7 + 5 + 3x Combine like terms: 7 + 5 = 12 12 + 3x = 12 + 3x Add '-12' to each side of the equation. 12 + -12 + 3x = 12 + -12 + 3x Combine like terms: 12 + -12 = 0 0 + 3x = 12 + -12 + 3x 3x = 12 + -12 + 3x Combine like terms: 12 + -12 = 0 3x = 0 + 3x 3x = 3x Add '-3x' to each side of the equation. 3x + -3x = 3x + -3x Combine like terms: 3x + -3x = 0 0 = 3x + -3x Combine like terms: 3x + -3x = 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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