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Simplifying 21 + 0.99n = 1.29n Solving 21 + 0.99n = 1.29n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1.29n' to each side of the equation. 21 + 0.99n + -1.29n = 1.29n + -1.29n Combine like terms: 0.99n + -1.29n = -0.3n 21 + -0.3n = 1.29n + -1.29n Combine like terms: 1.29n + -1.29n = 0.00 21 + -0.3n = 0.00 Add '-21' to each side of the equation. 21 + -21 + -0.3n = 0.00 + -21 Combine like terms: 21 + -21 = 0 0 + -0.3n = 0.00 + -21 -0.3n = 0.00 + -21 Combine like terms: 0.00 + -21 = -21 -0.3n = -21 Divide each side by '-0.3'. n = 70 Simplifying n = 70
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