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Simplifying 3(7x + 3) + 9 = 21x + 18 Reorder the terms: 3(3 + 7x) + 9 = 21x + 18 (3 * 3 + 7x * 3) + 9 = 21x + 18 (9 + 21x) + 9 = 21x + 18 Reorder the terms: 9 + 9 + 21x = 21x + 18 Combine like terms: 9 + 9 = 18 18 + 21x = 21x + 18 Reorder the terms: 18 + 21x = 18 + 21x Add '-18' to each side of the equation. 18 + -18 + 21x = 18 + -18 + 21x Combine like terms: 18 + -18 = 0 0 + 21x = 18 + -18 + 21x 21x = 18 + -18 + 21x Combine like terms: 18 + -18 = 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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