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Simplifying 9 + 11a = 21 + -5a Solving 9 + 11a = 21 + -5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '5a' to each side of the equation. 9 + 11a + 5a = 21 + -5a + 5a Combine like terms: 11a + 5a = 16a 9 + 16a = 21 + -5a + 5a Combine like terms: -5a + 5a = 0 9 + 16a = 21 + 0 9 + 16a = 21 Add '-9' to each side of the equation. 9 + -9 + 16a = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 16a = 21 + -9 16a = 21 + -9 Combine like terms: 21 + -9 = 12 16a = 12 Divide each side by '16'. a = 0.75 Simplifying a = 0.75
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