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Simplifying -3x + 2(6x + -9) = -81 Reorder the terms: -3x + 2(-9 + 6x) = -81 -3x + (-9 * 2 + 6x * 2) = -81 -3x + (-18 + 12x) = -81 Reorder the terms: -18 + -3x + 12x = -81 Combine like terms: -3x + 12x = 9x -18 + 9x = -81 Solving -18 + 9x = -81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + 9x = -81 + 18 Combine like terms: -18 + 18 = 0 0 + 9x = -81 + 18 9x = -81 + 18 Combine like terms: -81 + 18 = -63 9x = -63 Divide each side by '9'. x = -7 Simplifying x = -7
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