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