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Simplifying 3(-4x + -9) = 21 Reorder the terms: 3(-9 + -4x) = 21 (-9 * 3 + -4x * 3) = 21 (-27 + -12x) = 21 Solving -27 + -12x = 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 + -12x = 21 + 27 Combine like terms: -27 + 27 = 0 0 + -12x = 21 + 27 -12x = 21 + 27 Combine like terms: 21 + 27 = 48 -12x = 48 Divide each side by '-12'. x = -4 Simplifying x = -4
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