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Simplifying n + 40 = 21n Reorder the terms: 40 + n = 21n Solving 40 + n = 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. 40 + n + -21n = 21n + -21n Combine like terms: n + -21n = -20n 40 + -20n = 21n + -21n Combine like terms: 21n + -21n = 0 40 + -20n = 0 Add '-40' to each side of the equation. 40 + -40 + -20n = 0 + -40 Combine like terms: 40 + -40 = 0 0 + -20n = 0 + -40 -20n = 0 + -40 Combine like terms: 0 + -40 = -40 -20n = -40 Divide each side by '-20'. n = 2 Simplifying n = 2
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