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Simplifying 3(7x + 1) = 21x + -9 Reorder the terms: 3(1 + 7x) = 21x + -9 (1 * 3 + 7x * 3) = 21x + -9 (3 + 21x) = 21x + -9 Reorder the terms: 3 + 21x = -9 + 21x Add '-21x' to each side of the equation. 3 + 21x + -21x = -9 + 21x + -21x Combine like terms: 21x + -21x = 0 3 + 0 = -9 + 21x + -21x 3 = -9 + 21x + -21x Combine like terms: 21x + -21x = 0 3 = -9 + 0 3 = -9 Solving 3 = -9 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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