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Simplifying 3(7x + 1) = 21x + 3 Reorder the terms: 3(1 + 7x) = 21x + 3 (1 * 3 + 7x * 3) = 21x + 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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