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Simplifying 80 = 20 + -1a + -1a + -2a Combine like terms: -1a + -1a = -2a 80 = 20 + -2a + -2a Combine like terms: -2a + -2a = -4a 80 = 20 + -4a Solving 80 = 20 + -4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4a' to each side of the equation. 80 + 4a = 20 + -4a + 4a Combine like terms: -4a + 4a = 0 80 + 4a = 20 + 0 80 + 4a = 20 Add '-80' to each side of the equation. 80 + -80 + 4a = 20 + -80 Combine like terms: 80 + -80 = 0 0 + 4a = 20 + -80 4a = 20 + -80 Combine like terms: 20 + -80 = -60 4a = -60 Divide each side by '4'. a = -15 Simplifying a = -15
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