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Simplifying 20 = 2 + -1(a + 8) Reorder the terms: 20 = 2 + -1(8 + a) 20 = 2 + (8 * -1 + a * -1) 20 = 2 + (-8 + -1a) Combine like terms: 2 + -8 = -6 20 = -6 + -1a Solving 20 = -6 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 20 + a = -6 + -1a + a Combine like terms: -1a + a = 0 20 + a = -6 + 0 20 + a = -6 Add '-20' to each side of the equation. 20 + -20 + a = -6 + -20 Combine like terms: 20 + -20 = 0 0 + a = -6 + -20 a = -6 + -20 Combine like terms: -6 + -20 = -26 a = -26 Simplifying a = -26
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