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Simplifying 120 + 80a + -3 = 640 Reorder the terms: 120 + -3 + 80a = 640 Combine like terms: 120 + -3 = 117 117 + 80a = 640 Solving 117 + 80a = 640 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-117' to each side of the equation. 117 + -117 + 80a = 640 + -117 Combine like terms: 117 + -117 = 0 0 + 80a = 640 + -117 80a = 640 + -117 Combine like terms: 640 + -117 = 523 80a = 523 Divide each side by '80'. a = 6.5375 Simplifying a = 6.5375
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