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Simplifying 4x + 21x + -7 = 5(5x + 9) Reorder the terms: -7 + 4x + 21x = 5(5x + 9) Combine like terms: 4x + 21x = 25x -7 + 25x = 5(5x + 9) Reorder the terms: -7 + 25x = 5(9 + 5x) -7 + 25x = (9 * 5 + 5x * 5) -7 + 25x = (45 + 25x) Add '-25x' to each side of the equation. -7 + 25x + -25x = 45 + 25x + -25x Combine like terms: 25x + -25x = 0 -7 + 0 = 45 + 25x + -25x -7 = 45 + 25x + -25x Combine like terms: 25x + -25x = 0 -7 = 45 + 0 -7 = 45 Solving -7 = 45 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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