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