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Simplifying -5(4x + -1) + 4 = -20x + 9 Reorder the terms: -5(-1 + 4x) + 4 = -20x + 9 (-1 * -5 + 4x * -5) + 4 = -20x + 9 (5 + -20x) + 4 = -20x + 9 Reorder the terms: 5 + 4 + -20x = -20x + 9 Combine like terms: 5 + 4 = 9 9 + -20x = -20x + 9 Reorder the terms: 9 + -20x = 9 + -20x Add '-9' to each side of the equation. 9 + -9 + -20x = 9 + -9 + -20x Combine like terms: 9 + -9 = 0 0 + -20x = 9 + -9 + -20x -20x = 9 + -9 + -20x Combine like terms: 9 + -9 = 0 -20x = 0 + -20x -20x = -20x Add '20x' to each side of the equation. -20x + 20x = -20x + 20x Combine like terms: -20x + 20x = 0 0 = -20x + 20x Combine like terms: -20x + 20x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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