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Simplifying n + 3(n + -7) = 18 Reorder the terms: n + 3(-7 + n) = 18 n + (-7 * 3 + n * 3) = 18 n + (-21 + 3n) = 18 Reorder the terms: -21 + n + 3n = 18 Combine like terms: n + 3n = 4n -21 + 4n = 18 Solving -21 + 4n = 18 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 + 4n = 18 + 21 Combine like terms: -21 + 21 = 0 0 + 4n = 18 + 21 4n = 18 + 21 Combine like terms: 18 + 21 = 39 4n = 39 Divide each side by '4'. n = 9.75 Simplifying n = 9.75
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