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Simplifying -2(9 + 2a) = 0 (9 * -2 + 2a * -2) = 0 (-18 + -4a) = 0 Solving -18 + -4a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -4a = 0 + 18 Combine like terms: -18 + 18 = 0 0 + -4a = 0 + 18 -4a = 0 + 18 Combine like terms: 0 + 18 = 18 -4a = 18 Divide each side by '-4'. a = -4.5 Simplifying a = -4.5
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