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Simplifying 3n + 7(n + -3) = 19 Reorder the terms: 3n + 7(-3 + n) = 19 3n + (-3 * 7 + n * 7) = 19 3n + (-21 + 7n) = 19 Reorder the terms: -21 + 3n + 7n = 19 Combine like terms: 3n + 7n = 10n -21 + 10n = 19 Solving -21 + 10n = 19 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 10n = 19 + 21 Combine like terms: -21 + 21 = 0 0 + 10n = 19 + 21 10n = 19 + 21 Combine like terms: 19 + 21 = 40 10n = 40 Divide each side by '10'. n = 4 Simplifying n = 4
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