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