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Simplifying 4a + -2(a + 9) = 9 Reorder the terms: 4a + -2(9 + a) = 9 4a + (9 * -2 + a * -2) = 9 4a + (-18 + -2a) = 9 Reorder the terms: -18 + 4a + -2a = 9 Combine like terms: 4a + -2a = 2a -18 + 2a = 9 Solving -18 + 2a = 9 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 + 2a = 9 + 18 Combine like terms: -18 + 18 = 0 0 + 2a = 9 + 18 2a = 9 + 18 Combine like terms: 9 + 18 = 27 2a = 27 Divide each side by '2'. a = 13.5 Simplifying a = 13.5
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