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Simplifying -18 = 9(a + 1) Reorder the terms: -18 = 9(1 + a) -18 = (1 * 9 + a * 9) -18 = (9 + 9a) Solving -18 = 9 + 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. -18 + -9a = 9 + 9a + -9a Combine like terms: 9a + -9a = 0 -18 + -9a = 9 + 0 -18 + -9a = 9 Add '18' to each side of the equation. -18 + 18 + -9a = 9 + 18 Combine like terms: -18 + 18 = 0 0 + -9a = 9 + 18 -9a = 9 + 18 Combine like terms: 9 + 18 = 27 -9a = 27 Divide each side by '-9'. a = -3 Simplifying a = -3
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