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Simplifying 0.7(6 + -0.3n) = 2.1 (6 * 0.7 + -0.3n * 0.7) = 2.1 (4.2 + -0.21n) = 2.1 Solving 4.2 + -0.21n = 2.1 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4.2' to each side of the equation. 4.2 + -4.2 + -0.21n = 2.1 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + -0.21n = 2.1 + -4.2 -0.21n = 2.1 + -4.2 Combine like terms: 2.1 + -4.2 = -2.1 -0.21n = -2.1 Divide each side by '-0.21'. n = 10 Simplifying n = 10
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