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Simplifying 3(7x + 2) + 9 = 21x + 15 Reorder the terms: 3(2 + 7x) + 9 = 21x + 15 (2 * 3 + 7x * 3) + 9 = 21x + 15 (6 + 21x) + 9 = 21x + 15 Reorder the terms: 6 + 9 + 21x = 21x + 15 Combine like terms: 6 + 9 = 15 15 + 21x = 21x + 15 Reorder the terms: 15 + 21x = 15 + 21x Add '-15' to each side of the equation. 15 + -15 + 21x = 15 + -15 + 21x Combine like terms: 15 + -15 = 0 0 + 21x = 15 + -15 + 21x 21x = 15 + -15 + 21x Combine like terms: 15 + -15 = 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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