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Simplifying 15 = 4 + -1(n + 7) Reorder the terms: 15 = 4 + -1(7 + n) 15 = 4 + (7 * -1 + n * -1) 15 = 4 + (-7 + -1n) Combine like terms: 4 + -7 = -3 15 = -3 + -1n Solving 15 = -3 + -1n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add 'n' to each side of the equation. 15 + n = -3 + -1n + n Combine like terms: -1n + n = 0 15 + n = -3 + 0 15 + n = -3 Add '-15' to each side of the equation. 15 + -15 + n = -3 + -15 Combine like terms: 15 + -15 = 0 0 + n = -3 + -15 n = -3 + -15 Combine like terms: -3 + -15 = -18 n = -18 Simplifying n = -18
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