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Simplifying 5a + 8 + -4 = -21 Reorder the terms: 8 + -4 + 5a = -21 Combine like terms: 8 + -4 = 4 4 + 5a = -21 Solving 4 + 5a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 5a = -21 + -4 Combine like terms: 4 + -4 = 0 0 + 5a = -21 + -4 5a = -21 + -4 Combine like terms: -21 + -4 = -25 5a = -25 Divide each side by '5'. a = -5 Simplifying a = -5
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