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Simplifying -21 = 9a + -15 + -30a Reorder the terms: -21 = -15 + 9a + -30a Combine like terms: 9a + -30a = -21a -21 = -15 + -21a Solving -21 = -15 + -21a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21a' to each side of the equation. -21 + 21a = -15 + -21a + 21a Combine like terms: -21a + 21a = 0 -21 + 21a = -15 + 0 -21 + 21a = -15 Add '21' to each side of the equation. -21 + 21 + 21a = -15 + 21 Combine like terms: -21 + 21 = 0 0 + 21a = -15 + 21 21a = -15 + 21 Combine like terms: -15 + 21 = 6 21a = 6 Divide each side by '21'. a = 0.2857142857 Simplifying a = 0.2857142857
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