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Simplifying -1 = 2a + 9 Reorder the terms: -1 = 9 + 2a Solving -1 = 9 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. -1 + -2a = 9 + 2a + -2a Combine like terms: 2a + -2a = 0 -1 + -2a = 9 + 0 -1 + -2a = 9 Add '1' to each side of the equation. -1 + 1 + -2a = 9 + 1 Combine like terms: -1 + 1 = 0 0 + -2a = 9 + 1 -2a = 9 + 1 Combine like terms: 9 + 1 = 10 -2a = 10 Divide each side by '-2'. a = -5 Simplifying a = -5
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