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Simplifying 189 = 9(a + 6) Reorder the terms: 189 = 9(6 + a) 189 = (6 * 9 + a * 9) 189 = (54 + 9a) Solving 189 = 54 + 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. 189 + -9a = 54 + 9a + -9a Combine like terms: 9a + -9a = 0 189 + -9a = 54 + 0 189 + -9a = 54 Add '-189' to each side of the equation. 189 + -189 + -9a = 54 + -189 Combine like terms: 189 + -189 = 0 0 + -9a = 54 + -189 -9a = 54 + -189 Combine like terms: 54 + -189 = -135 -9a = -135 Divide each side by '-9'. a = 15 Simplifying a = 15
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