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Simplifying 20x = 20(2x + -4) Reorder the terms: 20x = 20(-4 + 2x) 20x = (-4 * 20 + 2x * 20) 20x = (-80 + 40x) Solving 20x = -80 + 40x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40x' to each side of the equation. 20x + -40x = -80 + 40x + -40x Combine like terms: 20x + -40x = -20x -20x = -80 + 40x + -40x Combine like terms: 40x + -40x = 0 -20x = -80 + 0 -20x = -80 Divide each side by '-20'. x = 4 Simplifying x = 4
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