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Simplifying 9a + 10(9n + -9) = 0 Reorder the terms: 9a + 10(-9 + 9n) = 0 9a + (-9 * 10 + 9n * 10) = 0 9a + (-90 + 90n) = 0 Reorder the terms: -90 + 9a + 90n = 0 Solving -90 + 9a + 90n = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '90' to each side of the equation. -90 + 9a + 90 + 90n = 0 + 90 Reorder the terms: -90 + 90 + 9a + 90n = 0 + 90 Combine like terms: -90 + 90 = 0 0 + 9a + 90n = 0 + 90 9a + 90n = 0 + 90 Combine like terms: 0 + 90 = 90 9a + 90n = 90 Add '-90n' to each side of the equation. 9a + 90n + -90n = 90 + -90n Combine like terms: 90n + -90n = 0 9a + 0 = 90 + -90n 9a = 90 + -90n Divide each side by '9'. a = 10 + -10n Simplifying a = 10 + -10n
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