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