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Simplifying 4a + 23 + -9a + -17 = 21 Reorder the terms: 23 + -17 + 4a + -9a = 21 Combine like terms: 23 + -17 = 6 6 + 4a + -9a = 21 Combine like terms: 4a + -9a = -5a 6 + -5a = 21 Solving 6 + -5a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -5a = 21 + -6 Combine like terms: 6 + -6 = 0 0 + -5a = 21 + -6 -5a = 21 + -6 Combine like terms: 21 + -6 = 15 -5a = 15 Divide each side by '-5'. a = -3 Simplifying a = -3
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