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Simplifying 7x + 21x + -5 = 7(4x + 7) Reorder the terms: -5 + 7x + 21x = 7(4x + 7) Combine like terms: 7x + 21x = 28x -5 + 28x = 7(4x + 7) Reorder the terms: -5 + 28x = 7(7 + 4x) -5 + 28x = (7 * 7 + 4x * 7) -5 + 28x = (49 + 28x) Add '-28x' to each side of the equation. -5 + 28x + -28x = 49 + 28x + -28x Combine like terms: 28x + -28x = 0 -5 + 0 = 49 + 28x + -28x -5 = 49 + 28x + -28x Combine like terms: 28x + -28x = 0 -5 = 49 + 0 -5 = 49 Solving -5 = 49 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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