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Simplifying 7(3x + 2) + -5 = 21x + 9 Reorder the terms: 7(2 + 3x) + -5 = 21x + 9 (2 * 7 + 3x * 7) + -5 = 21x + 9 (14 + 21x) + -5 = 21x + 9 Reorder the terms: 14 + -5 + 21x = 21x + 9 Combine like terms: 14 + -5 = 9 9 + 21x = 21x + 9 Reorder the terms: 9 + 21x = 9 + 21x Add '-9' to each side of the equation. 9 + -9 + 21x = 9 + -9 + 21x Combine like terms: 9 + -9 = 0 0 + 21x = 9 + -9 + 21x 21x = 9 + -9 + 21x Combine like terms: 9 + -9 = 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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