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Simplifying 9a + -4 = a + 20 Reorder the terms: -4 + 9a = a + 20 Reorder the terms: -4 + 9a = 20 + a Solving -4 + 9a = 20 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. -4 + 9a + -1a = 20 + a + -1a Combine like terms: 9a + -1a = 8a -4 + 8a = 20 + a + -1a Combine like terms: a + -1a = 0 -4 + 8a = 20 + 0 -4 + 8a = 20 Add '4' to each side of the equation. -4 + 4 + 8a = 20 + 4 Combine like terms: -4 + 4 = 0 0 + 8a = 20 + 4 8a = 20 + 4 Combine like terms: 20 + 4 = 24 8a = 24 Divide each side by '8'. a = 3 Simplifying a = 3
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