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Simplifying 4.3n + -2.1(n + 4) = 15 Reorder the terms: 4.3n + -2.1(4 + n) = 15 4.3n + (4 * -2.1 + n * -2.1) = 15 4.3n + (-8.4 + -2.1n) = 15 Reorder the terms: -8.4 + 4.3n + -2.1n = 15 Combine like terms: 4.3n + -2.1n = 2.2n -8.4 + 2.2n = 15 Solving -8.4 + 2.2n = 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 + 2.2n = 15 + 8.4 Combine like terms: -8.4 + 8.4 = 0.0 0.0 + 2.2n = 15 + 8.4 2.2n = 15 + 8.4 Combine like terms: 15 + 8.4 = 23.4 2.2n = 23.4 Divide each side by '2.2'. n = 10.63636364 Simplifying n = 10.63636364
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