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Simplifying 68 = 0.8(200 + -1a) 68 = (200 * 0.8 + -1a * 0.8) 68 = (160 + -0.8a) Solving 68 = 160 + -0.8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.8a' to each side of the equation. 68 + 0.8a = 160 + -0.8a + 0.8a Combine like terms: -0.8a + 0.8a = 0.0 68 + 0.8a = 160 + 0.0 68 + 0.8a = 160 Add '-68' to each side of the equation. 68 + -68 + 0.8a = 160 + -68 Combine like terms: 68 + -68 = 0 0 + 0.8a = 160 + -68 0.8a = 160 + -68 Combine like terms: 160 + -68 = 92 0.8a = 92 Divide each side by '0.8'. a = 115 Simplifying a = 115
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