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Simplifying 3(7x + 4) = 21x + 21 Reorder the terms: 3(4 + 7x) = 21x + 21 (4 * 3 + 7x * 3) = 21x + 21 (12 + 21x) = 21x + 21 Reorder the terms: 12 + 21x = 21 + 21x Add '-21x' to each side of the equation. 12 + 21x + -21x = 21 + 21x + -21x Combine like terms: 21x + -21x = 0 12 + 0 = 21 + 21x + -21x 12 = 21 + 21x + -21x Combine like terms: 21x + -21x = 0 12 = 21 + 0 12 = 21 Solving 12 = 21 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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