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Simplifying 3a + -15 + -9a = -21 Reorder the terms: -15 + 3a + -9a = -21 Combine like terms: 3a + -9a = -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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