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Simplifying 21 + 25n = 42 + 18n Solving 21 + 25n = 42 + 18n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-18n' to each side of the equation. 21 + 25n + -18n = 42 + 18n + -18n Combine like terms: 25n + -18n = 7n 21 + 7n = 42 + 18n + -18n Combine like terms: 18n + -18n = 0 21 + 7n = 42 + 0 21 + 7n = 42 Add '-21' to each side of the equation. 21 + -21 + 7n = 42 + -21 Combine like terms: 21 + -21 = 0 0 + 7n = 42 + -21 7n = 42 + -21 Combine like terms: 42 + -21 = 21 7n = 21 Divide each side by '7'. n = 3 Simplifying n = 3
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