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Simplifying 9a + -15 + -3a = -21 Reorder the terms: -15 + 9a + -3a = -21 Combine like terms: 9a + -3a = 6a -15 + 6a = -21 Solving -15 + 6a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 6a = -21 + 15 Combine like terms: -15 + 15 = 0 0 + 6a = -21 + 15 6a = -21 + 15 Combine like terms: -21 + 15 = -6 6a = -6 Divide each side by '6'. a = -1 Simplifying a = -1
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