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Simplifying 9x + 12 = 9x + -18 Reorder the terms: 12 + 9x = 9x + -18 Reorder the terms: 12 + 9x = -18 + 9x Add '-9x' to each side of the equation. 12 + 9x + -9x = -18 + 9x + -9x Combine like terms: 9x + -9x = 0 12 + 0 = -18 + 9x + -9x 12 = -18 + 9x + -9x Combine like terms: 9x + -9x = 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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