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Simplifying 0.5(220 + -1a) = 99 (220 * 0.5 + -1a * 0.5) = 99 (110 + -0.5a) = 99 Solving 110 + -0.5a = 99 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-110' to each side of the equation. 110 + -110 + -0.5a = 99 + -110 Combine like terms: 110 + -110 = 0 0 + -0.5a = 99 + -110 -0.5a = 99 + -110 Combine like terms: 99 + -110 = -11 -0.5a = -11 Divide each side by '-0.5'. a = 22 Simplifying a = 22
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