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Simplifying 12 + x = 9 + (x + -6) + 15 Reorder the terms: 12 + x = 9 + (-6 + x) + 15 Remove parenthesis around (-6 + x) 12 + x = 9 + -6 + x + 15 Reorder the terms: 12 + x = 9 + -6 + 15 + x Combine like terms: 9 + -6 = 3 12 + x = 3 + 15 + x Combine like terms: 3 + 15 = 18 12 + x = 18 + x Add '-1x' to each side of the equation. 12 + x + -1x = 18 + x + -1x Combine like terms: x + -1x = 0 12 + 0 = 18 + x + -1x 12 = 18 + x + -1x Combine like terms: x + -1x = 0 12 = 18 + 0 12 = 18 Solving 12 = 18 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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