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Simplifying 640 = 39.2a * 800 Reorder the terms for easier multiplication: 640 = 39.2 * 800a Multiply 39.2 * 800 640 = 31360a Solving 640 = 31360a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-31360a' to each side of the equation. 640 + -31360a = 31360a + -31360a Combine like terms: 31360a + -31360a = 0 640 + -31360a = 0 Add '-640' to each side of the equation. 640 + -640 + -31360a = 0 + -640 Combine like terms: 640 + -640 = 0 0 + -31360a = 0 + -640 -31360a = 0 + -640 Combine like terms: 0 + -640 = -640 -31360a = -640 Divide each side by '-31360'. a = 0.02040816327 Simplifying a = 0.02040816327
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