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Simplifying 60a + 80(20 + -1a) = 600 60a + (20 * 80 + -1a * 80) = 600 60a + (1600 + -80a) = 600 Reorder the terms: 1600 + 60a + -80a = 600 Combine like terms: 60a + -80a = -20a 1600 + -20a = 600 Solving 1600 + -20a = 600 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1600' to each side of the equation. 1600 + -1600 + -20a = 600 + -1600 Combine like terms: 1600 + -1600 = 0 0 + -20a = 600 + -1600 -20a = 600 + -1600 Combine like terms: 600 + -1600 = -1000 -20a = -1000 Divide each side by '-20'. a = 50 Simplifying a = 50
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