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Simplifying -7(7x + 8) = -399 Reorder the terms: -7(8 + 7x) = -399 (8 * -7 + 7x * -7) = -399 (-56 + -49x) = -399 Solving -56 + -49x = -399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '56' to each side of the equation. -56 + 56 + -49x = -399 + 56 Combine like terms: -56 + 56 = 0 0 + -49x = -399 + 56 -49x = -399 + 56 Combine like terms: -399 + 56 = -343 -49x = -343 Divide each side by '-49'. x = 7 Simplifying x = 7
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