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Simplifying -7(8x + 7) = 399 Reorder the terms: -7(7 + 8x) = 399 (7 * -7 + 8x * -7) = 399 (-49 + -56x) = 399 Solving -49 + -56x = 399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + -56x = 399 + 49 Combine like terms: -49 + 49 = 0 0 + -56x = 399 + 49 -56x = 399 + 49 Combine like terms: 399 + 49 = 448 -56x = 448 Divide each side by '-56'. x = -8 Simplifying x = -8
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