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Simplifying 7(3n + -4) = 140 Reorder the terms: 7(-4 + 3n) = 140 (-4 * 7 + 3n * 7) = 140 (-28 + 21n) = 140 Solving -28 + 21n = 140 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 21n = 140 + 28 Combine like terms: -28 + 28 = 0 0 + 21n = 140 + 28 21n = 140 + 28 Combine like terms: 140 + 28 = 168 21n = 168 Divide each side by '21'. n = 8 Simplifying n = 8
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