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Simplifying 0.15n + 0.07(2200 + -1n) = 0.09(2200) 0.15n + (2200 * 0.07 + -1n * 0.07) = 0.09(2200) 0.15n + (154 + -0.07n) = 0.09(2200) Reorder the terms: 154 + 0.15n + -0.07n = 0.09(2200) Combine like terms: 0.15n + -0.07n = 0.08n 154 + 0.08n = 0.09(2200) Multiply 0.09 * 2200 154 + 0.08n = 198 Solving 154 + 0.08n = 198 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-154' to each side of the equation. 154 + -154 + 0.08n = 198 + -154 Combine like terms: 154 + -154 = 0 0 + 0.08n = 198 + -154 0.08n = 198 + -154 Combine like terms: 198 + -154 = 44 0.08n = 44 Divide each side by '0.08'. n = 550 Simplifying n = 550
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