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Simplifying -7x = 20x + 21 Reorder the terms: -7x = 21 + 20x Solving -7x = 21 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. -7x + -20x = 21 + 20x + -20x Combine like terms: -7x + -20x = -27x -27x = 21 + 20x + -20x Combine like terms: 20x + -20x = 0 -27x = 21 + 0 -27x = 21 Divide each side by '-27'. x = -0.7777777778 Simplifying x = -0.7777777778
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