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Simplifying 4(x + 5) + -9x = -5x + 12 Reorder the terms: 4(5 + x) + -9x = -5x + 12 (5 * 4 + x * 4) + -9x = -5x + 12 (20 + 4x) + -9x = -5x + 12 Combine like terms: 4x + -9x = -5x 20 + -5x = -5x + 12 Reorder the terms: 20 + -5x = 12 + -5x Add '5x' to each side of the equation. 20 + -5x + 5x = 12 + -5x + 5x Combine like terms: -5x + 5x = 0 20 + 0 = 12 + -5x + 5x 20 = 12 + -5x + 5x Combine like terms: -5x + 5x = 0 20 = 12 + 0 20 = 12 Solving 20 = 12 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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