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Simplifying -9a + -81 = 9(a + 9) Reorder the terms: -81 + -9a = 9(a + 9) Reorder the terms: -81 + -9a = 9(9 + a) -81 + -9a = (9 * 9 + a * 9) -81 + -9a = (81 + 9a) Solving -81 + -9a = 81 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. -81 + -9a + -9a = 81 + 9a + -9a Combine like terms: -9a + -9a = -18a -81 + -18a = 81 + 9a + -9a Combine like terms: 9a + -9a = 0 -81 + -18a = 81 + 0 -81 + -18a = 81 Add '81' to each side of the equation. -81 + 81 + -18a = 81 + 81 Combine like terms: -81 + 81 = 0 0 + -18a = 81 + 81 -18a = 81 + 81 Combine like terms: 81 + 81 = 162 -18a = 162 Divide each side by '-18'. a = -9 Simplifying a = -9
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