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Simplifying 7(5x + -3) = 399 Reorder the terms: 7(-3 + 5x) = 399 (-3 * 7 + 5x * 7) = 399 (-21 + 35x) = 399 Solving -21 + 35x = 399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 35x = 399 + 21 Combine like terms: -21 + 21 = 0 0 + 35x = 399 + 21 35x = 399 + 21 Combine like terms: 399 + 21 = 420 35x = 420 Divide each side by '35'. x = 12 Simplifying x = 12
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