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Simplifying 7(6x + -9) = 399 Reorder the terms: 7(-9 + 6x) = 399 (-9 * 7 + 6x * 7) = 399 (-63 + 42x) = 399 Solving -63 + 42x = 399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 42x = 399 + 63 Combine like terms: -63 + 63 = 0 0 + 42x = 399 + 63 42x = 399 + 63 Combine like terms: 399 + 63 = 462 42x = 462 Divide each side by '42'. x = 11 Simplifying x = 11
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