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Simplifying 21x = 4(5x + -2) Reorder the terms: 21x = 4(-2 + 5x) 21x = (-2 * 4 + 5x * 4) 21x = (-8 + 20x) Solving 21x = -8 + 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 = -8 + 20x + -20x Combine like terms: 21x + -20x = 1x 1x = -8 + 20x + -20x Combine like terms: 20x + -20x = 0 1x = -8 + 0 1x = -8 Divide each side by '1'. x = -8 Simplifying x = -8
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