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Simplifying 3(7x + -9) = -216 Reorder the terms: 3(-9 + 7x) = -216 (-9 * 3 + 7x * 3) = -216 (-27 + 21x) = -216 Solving -27 + 21x = -216 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 + 21x = -216 + 27 Combine like terms: -27 + 27 = 0 0 + 21x = -216 + 27 21x = -216 + 27 Combine like terms: -216 + 27 = -189 21x = -189 Divide each side by '21'. x = -9 Simplifying x = -9
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