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Simplifying 15 = 2(n + 7) + -21 Reorder the terms: 15 = 2(7 + n) + -21 15 = (7 * 2 + n * 2) + -21 15 = (14 + 2n) + -21 Reorder the terms: 15 = 14 + -21 + 2n Combine like terms: 14 + -21 = -7 15 = -7 + 2n Solving 15 = -7 + 2n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-2n' to each side of the equation. 15 + -2n = -7 + 2n + -2n Combine like terms: 2n + -2n = 0 15 + -2n = -7 + 0 15 + -2n = -7 Add '-15' to each side of the equation. 15 + -15 + -2n = -7 + -15 Combine like terms: 15 + -15 = 0 0 + -2n = -7 + -15 -2n = -7 + -15 Combine like terms: -7 + -15 = -22 -2n = -22 Divide each side by '-2'. n = 11 Simplifying n = 11
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