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Simplifying 18 + -1a = 2(6 + -1a) 18 + -1a = (6 * 2 + -1a * 2) 18 + -1a = (12 + -2a) Solving 18 + -1a = 12 + -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. 18 + -1a + 2a = 12 + -2a + 2a Combine like terms: -1a + 2a = 1a 18 + 1a = 12 + -2a + 2a Combine like terms: -2a + 2a = 0 18 + 1a = 12 + 0 18 + 1a = 12 Add '-18' to each side of the equation. 18 + -18 + 1a = 12 + -18 Combine like terms: 18 + -18 = 0 0 + 1a = 12 + -18 1a = 12 + -18 Combine like terms: 12 + -18 = -6 1a = -6 Divide each side by '1'. a = -6 Simplifying a = -6
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