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Simplifying 5 + 8a + -5a = 21 + a Combine like terms: 8a + -5a = 3a 5 + 3a = 21 + a Solving 5 + 3a = 21 + a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 5 + 3a + -1a = 21 + a + -1a Combine like terms: 3a + -1a = 2a 5 + 2a = 21 + a + -1a Combine like terms: a + -1a = 0 5 + 2a = 21 + 0 5 + 2a = 21 Add '-5' to each side of the equation. 5 + -5 + 2a = 21 + -5 Combine like terms: 5 + -5 = 0 0 + 2a = 21 + -5 2a = 21 + -5 Combine like terms: 21 + -5 = 16 2a = 16 Divide each side by '2'. a = 8 Simplifying a = 8
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