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Simplifying 21x = 5(4x + -6) Reorder the terms: 21x = 5(-6 + 4x) 21x = (-6 * 5 + 4x * 5) 21x = (-30 + 20x) Solving 21x = -30 + 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. 21x + -20x = -30 + 20x + -20x Combine like terms: 21x + -20x = 1x 1x = -30 + 20x + -20x Combine like terms: 20x + -20x = 0 1x = -30 + 0 1x = -30 Divide each side by '1'. x = -30 Simplifying x = -30
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