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Simplifying 21 = 9a + -15 + -3a Reorder the terms: 21 = -15 + 9a + -3a Combine like terms: 9a + -3a = 6a 21 = -15 + 6a Solving 21 = -15 + 6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6a' to each side of the equation. 21 + -6a = -15 + 6a + -6a Combine like terms: 6a + -6a = 0 21 + -6a = -15 + 0 21 + -6a = -15 Add '-21' to each side of the equation. 21 + -21 + -6a = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -6a = -15 + -21 -6a = -15 + -21 Combine like terms: -15 + -21 = -36 -6a = -36 Divide each side by '-6'. a = 6 Simplifying a = 6
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