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Simplifying 12x + 15 = 3x + 9x + 15 Reorder the terms: 15 + 12x = 3x + 9x + 15 Reorder the terms: 15 + 12x = 15 + 3x + 9x Combine like terms: 3x + 9x = 12x 15 + 12x = 15 + 12x Add '-15' to each side of the equation. 15 + -15 + 12x = 15 + -15 + 12x Combine like terms: 15 + -15 = 0 0 + 12x = 15 + -15 + 12x 12x = 15 + -15 + 12x Combine like terms: 15 + -15 = 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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