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Simplifying -1 = 0.5a + 9 Reorder the terms: -1 = 9 + 0.5a Solving -1 = 9 + 0.5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.5a' to each side of the equation. -1 + -0.5a = 9 + 0.5a + -0.5a Combine like terms: 0.5a + -0.5a = 0.0 -1 + -0.5a = 9 + 0.0 -1 + -0.5a = 9 Add '1' to each side of the equation. -1 + 1 + -0.5a = 9 + 1 Combine like terms: -1 + 1 = 0 0 + -0.5a = 9 + 1 -0.5a = 9 + 1 Combine like terms: 9 + 1 = 10 -0.5a = 10 Divide each side by '-0.5'. a = -20 Simplifying a = -20
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