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Simplifying 5x + -1(4 + 8x) = 20 5x + (4 * -1 + 8x * -1) = 20 5x + (-4 + -8x) = 20 Reorder the terms: -4 + 5x + -8x = 20 Combine like terms: 5x + -8x = -3x -4 + -3x = 20 Solving -4 + -3x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -3x = 20 + 4 Combine like terms: -4 + 4 = 0 0 + -3x = 20 + 4 -3x = 20 + 4 Combine like terms: 20 + 4 = 24 -3x = 24 Divide each side by '-3'. x = -8 Simplifying x = -8

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