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Simplifying 20x + -1(8x + 15) = 3(4x + -5) Reorder the terms: 20x + -1(15 + 8x) = 3(4x + -5) 20x + (15 * -1 + 8x * -1) = 3(4x + -5) 20x + (-15 + -8x) = 3(4x + -5) Reorder the terms: -15 + 20x + -8x = 3(4x + -5) Combine like terms: 20x + -8x = 12x -15 + 12x = 3(4x + -5) Reorder the terms: -15 + 12x = 3(-5 + 4x) -15 + 12x = (-5 * 3 + 4x * 3) -15 + 12x = (-15 + 12x) Add '15' to each side of the equation. -15 + 15 + 12x = -15 + 15 + 12x Combine like terms: -15 + 15 = 0 0 + 12x = -15 + 15 + 12x 12x = -15 + 15 + 12x Combine like terms: -15 + 15 = 0 12x = 0 + 12x 12x = 12x Add '-12x' to each side of the equation. 12x + -12x = 12x + -12x Combine like terms: 12x + -12x = 0 0 = 12x + -12x Combine like terms: 12x + -12x = 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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