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Simplifying 8 + -7x = 20x + 21 Reorder the terms: 8 + -7x = 21 + 20x Solving 8 + -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. 8 + -7x + -20x = 21 + 20x + -20x Combine like terms: -7x + -20x = -27x 8 + -27x = 21 + 20x + -20x Combine like terms: 20x + -20x = 0 8 + -27x = 21 + 0 8 + -27x = 21 Add '-8' to each side of the equation. 8 + -8 + -27x = 21 + -8 Combine like terms: 8 + -8 = 0 0 + -27x = 21 + -8 -27x = 21 + -8 Combine like terms: 21 + -8 = 13 -27x = 13 Divide each side by '-27'. x = -0.4814814815 Simplifying x = -0.4814814815
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