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Simplifying 9(2a + -1) = 4 Reorder the terms: 9(-1 + 2a) = 4 (-1 * 9 + 2a * 9) = 4 (-9 + 18a) = 4 Solving -9 + 18a = 4 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 18a = 4 + 9 Combine like terms: -9 + 9 = 0 0 + 18a = 4 + 9 18a = 4 + 9 Combine like terms: 4 + 9 = 13 18a = 13 Divide each side by '18'. a = 0.7222222222 Simplifying a = 0.7222222222
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