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Simplifying 81 = 3(3x + 6) Reorder the terms: 81 = 3(6 + 3x) 81 = (6 * 3 + 3x * 3) 81 = (18 + 9x) Solving 81 = 18 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 81 + -9x = 18 + 9x + -9x Combine like terms: 9x + -9x = 0 81 + -9x = 18 + 0 81 + -9x = 18 Add '-81' to each side of the equation. 81 + -81 + -9x = 18 + -81 Combine like terms: 81 + -81 = 0 0 + -9x = 18 + -81 -9x = 18 + -81 Combine like terms: 18 + -81 = -63 -9x = -63 Divide each side by '-9'. x = 7 Simplifying x = 7
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