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