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Simplifying 7 + (x + 5) = (7 + x) + 5 Reorder the terms: 7 + (5 + x) = (7 + x) + 5 Remove parenthesis around (5 + x) 7 + 5 + x = (7 + x) + 5 Combine like terms: 7 + 5 = 12 12 + x = (7 + x) + 5 Remove parenthesis around (7 + x) 12 + x = 7 + x + 5 Reorder the terms: 12 + x = 7 + 5 + x Combine like terms: 7 + 5 = 12 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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