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Simplifying 72 + -7x = 20x + 21 Reorder the terms: 72 + -7x = 21 + 20x Solving 72 + -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. 72 + -7x + -20x = 21 + 20x + -20x Combine like terms: -7x + -20x = -27x 72 + -27x = 21 + 20x + -20x Combine like terms: 20x + -20x = 0 72 + -27x = 21 + 0 72 + -27x = 21 Add '-72' to each side of the equation. 72 + -72 + -27x = 21 + -72 Combine like terms: 72 + -72 = 0 0 + -27x = 21 + -72 -27x = 21 + -72 Combine like terms: 21 + -72 = -51 -27x = -51 Divide each side by '-27'. x = 1.888888889 Simplifying x = 1.888888889
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