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Simplifying 3(7x + -5) + 1 = 21x Reorder the terms: 3(-5 + 7x) + 1 = 21x (-5 * 3 + 7x * 3) + 1 = 21x (-15 + 21x) + 1 = 21x Reorder the terms: -15 + 1 + 21x = 21x Combine like terms: -15 + 1 = -14 -14 + 21x = 21x Add '-21x' to each side of the equation. -14 + 21x + -21x = 21x + -21x Combine like terms: 21x + -21x = 0 -14 + 0 = 21x + -21x -14 = 21x + -21x Combine like terms: 21x + -21x = 0 -14 = 0 Solving -14 = 0 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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