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Simplifying 7x + 21x + -1 = 7(4x + 2) Reorder the terms: -1 + 7x + 21x = 7(4x + 2) Combine like terms: 7x + 21x = 28x -1 + 28x = 7(4x + 2) Reorder the terms: -1 + 28x = 7(2 + 4x) -1 + 28x = (2 * 7 + 4x * 7) -1 + 28x = (14 + 28x) Add '-28x' to each side of the equation. -1 + 28x + -28x = 14 + 28x + -28x Combine like terms: 28x + -28x = 0 -1 + 0 = 14 + 28x + -28x -1 = 14 + 28x + -28x Combine like terms: 28x + -28x = 0 -1 = 14 + 0 -1 = 14 Solving -1 = 14 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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