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Simplifying 4a = 20 + -1a Solving 4a = 20 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. 4a + a = 20 + -1a + a Combine like terms: 4a + a = 5a 5a = 20 + -1a + a Combine like terms: -1a + a = 0 5a = 20 + 0 5a = 20 Divide each side by '5'. a = 4 Simplifying a = 4
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