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Simplifying -30 = -2(a + 9) Reorder the terms: -30 = -2(9 + a) -30 = (9 * -2 + a * -2) -30 = (-18 + -2a) Solving -30 = -18 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. -30 + 2a = -18 + -2a + 2a Combine like terms: -2a + 2a = 0 -30 + 2a = -18 + 0 -30 + 2a = -18 Add '30' to each side of the equation. -30 + 30 + 2a = -18 + 30 Combine like terms: -30 + 30 = 0 0 + 2a = -18 + 30 2a = -18 + 30 Combine like terms: -18 + 30 = 12 2a = 12 Divide each side by '2'. a = 6 Simplifying a = 6
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