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Simplifying -3(2x + 9) = -21 Reorder the terms: -3(9 + 2x) = -21 (9 * -3 + 2x * -3) = -21 (-27 + -6x) = -21 Solving -27 + -6x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + -6x = -21 + 27 Combine like terms: -27 + 27 = 0 0 + -6x = -21 + 27 -6x = -21 + 27 Combine like terms: -21 + 27 = 6 -6x = 6 Divide each side by '-6'. x = -1 Simplifying x = -1
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