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Simplifying 7n = 9(n + -20) Reorder the terms: 7n = 9(-20 + n) 7n = (-20 * 9 + n * 9) 7n = (-180 + 9n) Solving 7n = -180 + 9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9n' to each side of the equation. 7n + -9n = -180 + 9n + -9n Combine like terms: 7n + -9n = -2n -2n = -180 + 9n + -9n Combine like terms: 9n + -9n = 0 -2n = -180 + 0 -2n = -180 Divide each side by '-2'. n = 90 Simplifying n = 90
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