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Simplifying -21 = 7(1 + -2n) -21 = (1 * 7 + -2n * 7) -21 = (7 + -14n) Solving -21 = 7 + -14n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '14n' to each side of the equation. -21 + 14n = 7 + -14n + 14n Combine like terms: -14n + 14n = 0 -21 + 14n = 7 + 0 -21 + 14n = 7 Add '21' to each side of the equation. -21 + 21 + 14n = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 14n = 7 + 21 14n = 7 + 21 Combine like terms: 7 + 21 = 28 14n = 28 Divide each side by '14'. n = 2 Simplifying n = 2
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