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Simplifying 2x + 4 + -5x = 12 + -15x + 12x + -8 Reorder the terms: 4 + 2x + -5x = 12 + -15x + 12x + -8 Combine like terms: 2x + -5x = -3x 4 + -3x = 12 + -15x + 12x + -8 Reorder the terms: 4 + -3x = 12 + -8 + -15x + 12x Combine like terms: 12 + -8 = 4 4 + -3x = 4 + -15x + 12x Combine like terms: -15x + 12x = -3x 4 + -3x = 4 + -3x Add '-4' to each side of the equation. 4 + -4 + -3x = 4 + -4 + -3x Combine like terms: 4 + -4 = 0 0 + -3x = 4 + -4 + -3x -3x = 4 + -4 + -3x Combine like terms: 4 + -4 = 0 -3x = 0 + -3x -3x = -3x Add '3x' to each side of the equation. -3x + 3x = -3x + 3x Combine like terms: -3x + 3x = 0 0 = -3x + 3x Combine like terms: -3x + 3x = 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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