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Simplifying 21x + -24 = 3(5x + -9) + 6x + 3 Reorder the terms: -24 + 21x = 3(5x + -9) + 6x + 3 Reorder the terms: -24 + 21x = 3(-9 + 5x) + 6x + 3 -24 + 21x = (-9 * 3 + 5x * 3) + 6x + 3 -24 + 21x = (-27 + 15x) + 6x + 3 Reorder the terms: -24 + 21x = -27 + 3 + 15x + 6x Combine like terms: -27 + 3 = -24 -24 + 21x = -24 + 15x + 6x Combine like terms: 15x + 6x = 21x -24 + 21x = -24 + 21x Add '24' to each side of the equation. -24 + 24 + 21x = -24 + 24 + 21x Combine like terms: -24 + 24 = 0 0 + 21x = -24 + 24 + 21x 21x = -24 + 24 + 21x Combine like terms: -24 + 24 = 0 21x = 0 + 21x 21x = 21x Add '-21x' to each side of the equation. 21x + -21x = 21x + -21x Combine like terms: 21x + -21x = 0 0 = 21x + -21x Combine like terms: 21x + -21x = 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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