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Simplifying 10x + 10x + -9 = 5(4x + 7) Reorder the terms: -9 + 10x + 10x = 5(4x + 7) Combine like terms: 10x + 10x = 20x -9 + 20x = 5(4x + 7) Reorder the terms: -9 + 20x = 5(7 + 4x) -9 + 20x = (7 * 5 + 4x * 5) -9 + 20x = (35 + 20x) Add '-20x' to each side of the equation. -9 + 20x + -20x = 35 + 20x + -20x Combine like terms: 20x + -20x = 0 -9 + 0 = 35 + 20x + -20x -9 = 35 + 20x + -20x Combine like terms: 20x + -20x = 0 -9 = 35 + 0 -9 = 35 Solving -9 = 35 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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