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Simplifying 9a = 4(a + 20) Reorder the terms: 9a = 4(20 + a) 9a = (20 * 4 + a * 4) 9a = (80 + 4a) Solving 9a = 80 + 4a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4a' to each side of the equation. 9a + -4a = 80 + 4a + -4a Combine like terms: 9a + -4a = 5a 5a = 80 + 4a + -4a Combine like terms: 4a + -4a = 0 5a = 80 + 0 5a = 80 Divide each side by '5'. a = 16 Simplifying a = 16
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