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Simplifying 13a + 3a + 2a + a + -18a + 2 = 12 Reorder the terms: 2 + 13a + 3a + 2a + a + -18a = 12 Combine like terms: 13a + 3a = 16a 2 + 16a + 2a + a + -18a = 12 Combine like terms: 16a + 2a = 18a 2 + 18a + a + -18a = 12 Combine like terms: 18a + a = 19a 2 + 19a + -18a = 12 Combine like terms: 19a + -18a = 1a 2 + 1a = 12 Solving 2 + 1a = 12 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 1a = 12 + -2 Combine like terms: 2 + -2 = 0 0 + 1a = 12 + -2 1a = 12 + -2 Combine like terms: 12 + -2 = 10 1a = 10 Divide each side by '1'. a = 10 Simplifying a = 10
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