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Simplifying 189 = -9a + -9 Reorder the terms: 189 = -9 + -9a Solving 189 = -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. 189 + 9a = -9 + -9a + 9a Combine like terms: -9a + 9a = 0 189 + 9a = -9 + 0 189 + 9a = -9 Add '-189' to each side of the equation. 189 + -189 + 9a = -9 + -189 Combine like terms: 189 + -189 = 0 0 + 9a = -9 + -189 9a = -9 + -189 Combine like terms: -9 + -189 = -198 9a = -198 Divide each side by '9'. a = -22 Simplifying a = -22
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