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Simplifying (4 + -1n) * 2.1 + -4.3n = 15 Reorder the terms for easier multiplication: 2.1(4 + -1n) + -4.3n = 15 (4 * 2.1 + -1n * 2.1) + -4.3n = 15 (8.4 + -2.1n) + -4.3n = 15 Combine like terms: -2.1n + -4.3n = -6.4n 8.4 + -6.4n = 15 Solving 8.4 + -6.4n = 15 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-8.4' to each side of the equation. 8.4 + -8.4 + -6.4n = 15 + -8.4 Combine like terms: 8.4 + -8.4 = 0.0 0.0 + -6.4n = 15 + -8.4 -6.4n = 15 + -8.4 Combine like terms: 15 + -8.4 = 6.6 -6.4n = 6.6 Divide each side by '-6.4'. n = -1.03125 Simplifying n = -1.03125
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