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Simplifying 0.7(6 + -0.3n) = 21 (6 * 0.7 + -0.3n * 0.7) = 21 (4.2 + -0.21n) = 21 Solving 4.2 + -0.21n = 21 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 = 21 + -4.2 Combine like terms: 4.2 + -4.2 = 0.0 0.0 + -0.21n = 21 + -4.2 -0.21n = 21 + -4.2 Combine like terms: 21 + -4.2 = 16.8 -0.21n = 16.8 Divide each side by '-0.21'. n = -80 Simplifying n = -80
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