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Simplifying 21x + -12 = 3(1 + 7x) Reorder the terms: -12 + 21x = 3(1 + 7x) -12 + 21x = (1 * 3 + 7x * 3) -12 + 21x = (3 + 21x) Add '-21x' to each side of the equation. -12 + 21x + -21x = 3 + 21x + -21x Combine like terms: 21x + -21x = 0 -12 + 0 = 3 + 21x + -21x -12 = 3 + 21x + -21x Combine like terms: 21x + -21x = 0 -12 = 3 + 0 -12 = 3 Solving -12 = 3 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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