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Simplifying 21x + -1 = 3(6x + -2) + 3x + 5 Reorder the terms: -1 + 21x = 3(6x + -2) + 3x + 5 Reorder the terms: -1 + 21x = 3(-2 + 6x) + 3x + 5 -1 + 21x = (-2 * 3 + 6x * 3) + 3x + 5 -1 + 21x = (-6 + 18x) + 3x + 5 Reorder the terms: -1 + 21x = -6 + 5 + 18x + 3x Combine like terms: -6 + 5 = -1 -1 + 21x = -1 + 18x + 3x Combine like terms: 18x + 3x = 21x -1 + 21x = -1 + 21x Add '1' to each side of the equation. -1 + 1 + 21x = -1 + 1 + 21x Combine like terms: -1 + 1 = 0 0 + 21x = -1 + 1 + 21x 21x = -1 + 1 + 21x Combine like terms: -1 + 1 = 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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