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Simplifying -1 + 4a = 9 Solving -1 + 4a = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 4a = 9 + 1 Combine like terms: -1 + 1 = 0 0 + 4a = 9 + 1 4a = 9 + 1 Combine like terms: 9 + 1 = 10 4a = 10 Divide each side by '4'. a = 2.5 Simplifying a = 2.5
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