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Simplifying -5a + 8 + 4a = 21 Reorder the terms: 8 + -5a + 4a = 21 Combine like terms: -5a + 4a = -1a 8 + -1a = 21 Solving 8 + -1a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1a = 21 + -8 Combine like terms: 8 + -8 = 0 0 + -1a = 21 + -8 -1a = 21 + -8 Combine like terms: 21 + -8 = 13 -1a = 13 Divide each side by '-1'. a = -13 Simplifying a = -13
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