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Simplifying 9 + 11 = 5a + 21 Combine like terms: 9 + 11 = 20 20 = 5a + 21 Reorder the terms: 20 = 21 + 5a Solving 20 = 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. 20 + -5a = 21 + 5a + -5a Combine like terms: 5a + -5a = 0 20 + -5a = 21 + 0 20 + -5a = 21 Add '-20' to each side of the equation. 20 + -20 + -5a = 21 + -20 Combine like terms: 20 + -20 = 0 0 + -5a = 21 + -20 -5a = 21 + -20 Combine like terms: 21 + -20 = 1 -5a = 1 Divide each side by '-5'. a = -0.2 Simplifying a = -0.2
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