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Simplifying 3(7x + -2) = 21x + -6 Reorder the terms: 3(-2 + 7x) = 21x + -6 (-2 * 3 + 7x * 3) = 21x + -6 (-6 + 21x) = 21x + -6 Reorder the terms: -6 + 21x = -6 + 21x Add '6' to each side of the equation. -6 + 6 + 21x = -6 + 6 + 21x Combine like terms: -6 + 6 = 0 0 + 21x = -6 + 6 + 21x 21x = -6 + 6 + 21x Combine like terms: -6 + 6 = 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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