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Simplifying 12x + -18 = 9(x + -2) + 3x Reorder the terms: -18 + 12x = 9(x + -2) + 3x Reorder the terms: -18 + 12x = 9(-2 + x) + 3x -18 + 12x = (-2 * 9 + x * 9) + 3x -18 + 12x = (-18 + 9x) + 3x Combine like terms: 9x + 3x = 12x -18 + 12x = -18 + 12x Add '18' to each side of the equation. -18 + 18 + 12x = -18 + 18 + 12x Combine like terms: -18 + 18 = 0 0 + 12x = -18 + 18 + 12x 12x = -18 + 18 + 12x Combine like terms: -18 + 18 = 0 12x = 0 + 12x 12x = 12x Add '-12x' to each side of the equation. 12x + -12x = 12x + -12x Combine like terms: 12x + -12x = 0 0 = 12x + -12x Combine like terms: 12x + -12x = 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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