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Simplifying 21n + 4 = 7n + -4 Reorder the terms: 4 + 21n = 7n + -4 Reorder the terms: 4 + 21n = -4 + 7n Solving 4 + 21n = -4 + 7n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7n' to each side of the equation. 4 + 21n + -7n = -4 + 7n + -7n Combine like terms: 21n + -7n = 14n 4 + 14n = -4 + 7n + -7n Combine like terms: 7n + -7n = 0 4 + 14n = -4 + 0 4 + 14n = -4 Add '-4' to each side of the equation. 4 + -4 + 14n = -4 + -4 Combine like terms: 4 + -4 = 0 0 + 14n = -4 + -4 14n = -4 + -4 Combine like terms: -4 + -4 = -8 14n = -8 Divide each side by '14'. n = -0.5714285714 Simplifying n = -0.5714285714
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