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Simplifying -7(3x + -3) + 6 = -21x + 27 Reorder the terms: -7(-3 + 3x) + 6 = -21x + 27 (-3 * -7 + 3x * -7) + 6 = -21x + 27 (21 + -21x) + 6 = -21x + 27 Reorder the terms: 21 + 6 + -21x = -21x + 27 Combine like terms: 21 + 6 = 27 27 + -21x = -21x + 27 Reorder the terms: 27 + -21x = 27 + -21x Add '-27' to each side of the equation. 27 + -27 + -21x = 27 + -27 + -21x Combine like terms: 27 + -27 = 0 0 + -21x = 27 + -27 + -21x -21x = 27 + -27 + -21x Combine like terms: 27 + -27 = 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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