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Simplifying 2a + 1 + a = -20 Reorder the terms: 1 + 2a + a = -20 Combine like terms: 2a + a = 3a 1 + 3a = -20 Solving 1 + 3a = -20 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 3a = -20 + -1 Combine like terms: 1 + -1 = 0 0 + 3a = -20 + -1 3a = -20 + -1 Combine like terms: -20 + -1 = -21 3a = -21 Divide each side by '3'. a = -7 Simplifying a = -7
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