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Simplifying 70 = 7 + (n + -1) * 9 Reorder the terms: 70 = 7 + (-1 + n) * 9 Reorder the terms for easier multiplication: 70 = 7 + 9(-1 + n) 70 = 7 + (-1 * 9 + n * 9) 70 = 7 + (-9 + 9n) Combine like terms: 7 + -9 = -2 70 = -2 + 9n Solving 70 = -2 + 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. 70 + -9n = -2 + 9n + -9n Combine like terms: 9n + -9n = 0 70 + -9n = -2 + 0 70 + -9n = -2 Add '-70' to each side of the equation. 70 + -70 + -9n = -2 + -70 Combine like terms: 70 + -70 = 0 0 + -9n = -2 + -70 -9n = -2 + -70 Combine like terms: -2 + -70 = -72 -9n = -72 Divide each side by '-9'. n = 8 Simplifying n = 8
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