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Simplifying 2a + -1(-9) = 0 Multiply -1 * -9 2a + 9 = 0 Reorder the terms: 9 + 2a = 0 Solving 9 + 2a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 2a = 0 + -9 2a = 0 + -9 Combine like terms: 0 + -9 = -9 2a = -9 Divide each side by '2'. a = -4.5 Simplifying a = -4.5
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