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Simplifying -5.5(1 + -9a) = 21.5 (1 * -5.5 + -9a * -5.5) = 21.5 (-5.5 + 49.5a) = 21.5 Solving -5.5 + 49.5a = 21.5 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + 49.5a = 21.5 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + 49.5a = 21.5 + 5.5 49.5a = 21.5 + 5.5 Combine like terms: 21.5 + 5.5 = 27 49.5a = 27 Divide each side by '49.5'. a = 0.5454545455 Simplifying a = 0.5454545455
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