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Simplifying -5(3 + -4x) = -6 + 20x + -9 (3 * -5 + -4x * -5) = -6 + 20x + -9 (-15 + 20x) = -6 + 20x + -9 Reorder the terms: -15 + 20x = -6 + -9 + 20x Combine like terms: -6 + -9 = -15 -15 + 20x = -15 + 20x Add '15' to each side of the equation. -15 + 15 + 20x = -15 + 15 + 20x Combine like terms: -15 + 15 = 0 0 + 20x = -15 + 15 + 20x 20x = -15 + 15 + 20x Combine like terms: -15 + 15 = 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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