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Simplifying 126 + -7x = 20x + 21 Reorder the terms: 126 + -7x = 21 + 20x Solving 126 + -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. 126 + -7x + -20x = 21 + 20x + -20x Combine like terms: -7x + -20x = -27x 126 + -27x = 21 + 20x + -20x Combine like terms: 20x + -20x = 0 126 + -27x = 21 + 0 126 + -27x = 21 Add '-126' to each side of the equation. 126 + -126 + -27x = 21 + -126 Combine like terms: 126 + -126 = 0 0 + -27x = 21 + -126 -27x = 21 + -126 Combine like terms: 21 + -126 = -105 -27x = -105 Divide each side by '-27'. x = 3.888888889 Simplifying x = 3.888888889
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