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Simplifying 6a + 15a + 9 = 0 Reorder the terms: 9 + 6a + 15a = 0 Combine like terms: 6a + 15a = 21a 9 + 21a = 0 Solving 9 + 21a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 21a = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 21a = 0 + -9 21a = 0 + -9 Combine like terms: 0 + -9 = -9 21a = -9 Divide each side by '21'. a = -0.4285714286 Simplifying a = -0.4285714286
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