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Simplifying 21 + 2.5n = 4n Solving 21 + 2.5n = 4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4n' to each side of the equation. 21 + 2.5n + -4n = 4n + -4n Combine like terms: 2.5n + -4n = -1.5n 21 + -1.5n = 4n + -4n Combine like terms: 4n + -4n = 0 21 + -1.5n = 0 Add '-21' to each side of the equation. 21 + -21 + -1.5n = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1.5n = 0 + -21 -1.5n = 0 + -21 Combine like terms: 0 + -21 = -21 -1.5n = -21 Divide each side by '-1.5'. n = 14 Simplifying n = 14
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