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Simplifying 81 = 9(-5 + x) 81 = (-5 * 9 + x * 9) 81 = (-45 + 9x) Solving 81 = -45 + 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 = -45 + 9x + -9x Combine like terms: 9x + -9x = 0 81 + -9x = -45 + 0 81 + -9x = -45 Add '-81' to each side of the equation. 81 + -81 + -9x = -45 + -81 Combine like terms: 81 + -81 = 0 0 + -9x = -45 + -81 -9x = -45 + -81 Combine like terms: -45 + -81 = -126 -9x = -126 Divide each side by '-9'. x = 14 Simplifying x = 14
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