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Simplifying -21 = 9n + -15 + -3a Reorder the terms: -21 = -15 + -3a + 9n Solving -21 = -15 + -3a + 9n Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. -21 + 3a = -15 + -3a + 3a + 9n Combine like terms: -3a + 3a = 0 -21 + 3a = -15 + 0 + 9n -21 + 3a = -15 + 9n Add '21' to each side of the equation. -21 + 21 + 3a = -15 + 21 + 9n Combine like terms: -21 + 21 = 0 0 + 3a = -15 + 21 + 9n 3a = -15 + 21 + 9n Combine like terms: -15 + 21 = 6 3a = 6 + 9n Divide each side by '3'. a = 2 + 3n Simplifying a = 2 + 3n
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