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Simplifying 81 = -3x + 3(-5x + 3) Reorder the terms: 81 = -3x + 3(3 + -5x) 81 = -3x + (3 * 3 + -5x * 3) 81 = -3x + (9 + -15x) Reorder the terms: 81 = 9 + -3x + -15x Combine like terms: -3x + -15x = -18x 81 = 9 + -18x Solving 81 = 9 + -18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18x' to each side of the equation. 81 + 18x = 9 + -18x + 18x Combine like terms: -18x + 18x = 0 81 + 18x = 9 + 0 81 + 18x = 9 Add '-81' to each side of the equation. 81 + -81 + 18x = 9 + -81 Combine like terms: 81 + -81 = 0 0 + 18x = 9 + -81 18x = 9 + -81 Combine like terms: 9 + -81 = -72 18x = -72 Divide each side by '18'. x = -4 Simplifying x = -4
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