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Simplifying 18 = -2(2a + -1) Reorder the terms: 18 = -2(-1 + 2a) 18 = (-1 * -2 + 2a * -2) 18 = (2 + -4a) Solving 18 = 2 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. 18 + 4a = 2 + -4a + 4a Combine like terms: -4a + 4a = 0 18 + 4a = 2 + 0 18 + 4a = 2 Add '-18' to each side of the equation. 18 + -18 + 4a = 2 + -18 Combine like terms: 18 + -18 = 0 0 + 4a = 2 + -18 4a = 2 + -18 Combine like terms: 2 + -18 = -16 4a = -16 Divide each side by '4'. a = -4 Simplifying a = -4
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