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Simplifying 3a + 21 = a + -8 Reorder the terms: 21 + 3a = a + -8 Reorder the terms: 21 + 3a = -8 + a Solving 21 + 3a = -8 + 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. 21 + 3a + -1a = -8 + a + -1a Combine like terms: 3a + -1a = 2a 21 + 2a = -8 + a + -1a Combine like terms: a + -1a = 0 21 + 2a = -8 + 0 21 + 2a = -8 Add '-21' to each side of the equation. 21 + -21 + 2a = -8 + -21 Combine like terms: 21 + -21 = 0 0 + 2a = -8 + -21 2a = -8 + -21 Combine like terms: -8 + -21 = -29 2a = -29 Divide each side by '2'. a = -14.5 Simplifying a = -14.5
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