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Simplifying 7x + 21x + -9 = 7(4x + 9) Reorder the terms: -9 + 7x + 21x = 7(4x + 9) Combine like terms: 7x + 21x = 28x -9 + 28x = 7(4x + 9) Reorder the terms: -9 + 28x = 7(9 + 4x) -9 + 28x = (9 * 7 + 4x * 7) -9 + 28x = (63 + 28x) Add '-28x' to each side of the equation. -9 + 28x + -28x = 63 + 28x + -28x Combine like terms: 28x + -28x = 0 -9 + 0 = 63 + 28x + -28x -9 = 63 + 28x + -28x Combine like terms: 28x + -28x = 0 -9 = 63 + 0 -9 = 63 Solving -9 = 63 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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