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Simplifying 7 + 28n = 42 + 21n Solving 7 + 28n = 42 + 21n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21n' to each side of the equation. 7 + 28n + -21n = 42 + 21n + -21n Combine like terms: 28n + -21n = 7n 7 + 7n = 42 + 21n + -21n Combine like terms: 21n + -21n = 0 7 + 7n = 42 + 0 7 + 7n = 42 Add '-7' to each side of the equation. 7 + -7 + 7n = 42 + -7 Combine like terms: 7 + -7 = 0 0 + 7n = 42 + -7 7n = 42 + -7 Combine like terms: 42 + -7 = 35 7n = 35 Divide each side by '7'. n = 5 Simplifying n = 5
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