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Simplifying 20 + -1a = 3(4 + -1a) 20 + -1a = (4 * 3 + -1a * 3) 20 + -1a = (12 + -3a) Solving 20 + -1a = 12 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. 20 + -1a + 3a = 12 + -3a + 3a Combine like terms: -1a + 3a = 2a 20 + 2a = 12 + -3a + 3a Combine like terms: -3a + 3a = 0 20 + 2a = 12 + 0 20 + 2a = 12 Add '-20' to each side of the equation. 20 + -20 + 2a = 12 + -20 Combine like terms: 20 + -20 = 0 0 + 2a = 12 + -20 2a = 12 + -20 Combine like terms: 12 + -20 = -8 2a = -8 Divide each side by '2'. a = -4 Simplifying a = -4
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