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Simplifying 25 = 0.8(200 + -1a) 25 = (200 * 0.8 + -1a * 0.8) 25 = (160 + -0.8a) Solving 25 = 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. 25 + 0.8a = 160 + -0.8a + 0.8a Combine like terms: -0.8a + 0.8a = 0.0 25 + 0.8a = 160 + 0.0 25 + 0.8a = 160 Add '-25' to each side of the equation. 25 + -25 + 0.8a = 160 + -25 Combine like terms: 25 + -25 = 0 0 + 0.8a = 160 + -25 0.8a = 160 + -25 Combine like terms: 160 + -25 = 135 0.8a = 135 Divide each side by '0.8'. a = 168.75 Simplifying a = 168.75
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