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Simplifying -7(-9x + -6) = -399 Reorder the terms: -7(-6 + -9x) = -399 (-6 * -7 + -9x * -7) = -399 (42 + 63x) = -399 Solving 42 + 63x = -399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 63x = -399 + -42 Combine like terms: 42 + -42 = 0 0 + 63x = -399 + -42 63x = -399 + -42 Combine like terms: -399 + -42 = -441 63x = -441 Divide each side by '63'. x = -7 Simplifying x = -7
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