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Simplifying -8x + -4x + 9 = 9 + -12x Reorder the terms: 9 + -8x + -4x = 9 + -12x Combine like terms: -8x + -4x = -12x 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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