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Simplifying 81 = 3(7 + 2x) 81 = (7 * 3 + 2x * 3) 81 = (21 + 6x) Solving 81 = 21 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 81 + -6x = 21 + 6x + -6x Combine like terms: 6x + -6x = 0 81 + -6x = 21 + 0 81 + -6x = 21 Add '-81' to each side of the equation. 81 + -81 + -6x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -6x = 21 + -81 -6x = 21 + -81 Combine like terms: 21 + -81 = -60 -6x = -60 Divide each side by '-6'. x = 10 Simplifying x = 10
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