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Simplifying -3(x + 9) = -21 Reorder the terms: -3(9 + x) = -21 (9 * -3 + x * -3) = -21 (-27 + -3x) = -21 Solving -27 + -3x = -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 + -3x = -21 + 27 Combine like terms: -27 + 27 = 0 0 + -3x = -21 + 27 -3x = -21 + 27 Combine like terms: -21 + 27 = 6 -3x = 6 Divide each side by '-3'. x = -2 Simplifying x = -2
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