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Simplifying 3(9 + -1n) * 7 = 7 + 4 Reorder the terms for easier multiplication: 3 * 7(9 + -1n) = 7 + 4 Multiply 3 * 7 21(9 + -1n) = 7 + 4 (9 * 21 + -1n * 21) = 7 + 4 (189 + -21n) = 7 + 4 Combine like terms: 7 + 4 = 11 189 + -21n = 11 Solving 189 + -21n = 11 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-189' to each side of the equation. 189 + -189 + -21n = 11 + -189 Combine like terms: 189 + -189 = 0 0 + -21n = 11 + -189 -21n = 11 + -189 Combine like terms: 11 + -189 = -178 -21n = -178 Divide each side by '-21'. n = 8.476190476 Simplifying n = 8.476190476
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