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Simplifying 4x + -9(x + 1) = 20 + -5x Reorder the terms: 4x + -9(1 + x) = 20 + -5x 4x + (1 * -9 + x * -9) = 20 + -5x 4x + (-9 + -9x) = 20 + -5x Reorder the terms: -9 + 4x + -9x = 20 + -5x Combine like terms: 4x + -9x = -5x -9 + -5x = 20 + -5x Add '5x' to each side of the equation. -9 + -5x + 5x = 20 + -5x + 5x Combine like terms: -5x + 5x = 0 -9 + 0 = 20 + -5x + 5x -9 = 20 + -5x + 5x Combine like terms: -5x + 5x = 0 -9 = 20 + 0 -9 = 20 Solving -9 = 20 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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