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Simplifying 7n + -4(5 + -2n) = 20 7n + (5 * -4 + -2n * -4) = 20 7n + (-20 + 8n) = 20 Reorder the terms: -20 + 7n + 8n = 20 Combine like terms: 7n + 8n = 15n -20 + 15n = 20 Solving -20 + 15n = 20 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 15n = 20 + 20 Combine like terms: -20 + 20 = 0 0 + 15n = 20 + 20 15n = 20 + 20 Combine like terms: 20 + 20 = 40 15n = 40 Divide each side by '15'. n = 2.666666667 Simplifying n = 2.666666667
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