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Simplifying 15a + 6a + 4 = -17 Reorder the terms: 4 + 15a + 6a = -17 Combine like terms: 15a + 6a = 21a 4 + 21a = -17 Solving 4 + 21a = -17 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 21a = -17 + -4 Combine like terms: 4 + -4 = 0 0 + 21a = -17 + -4 21a = -17 + -4 Combine like terms: -17 + -4 = -21 21a = -21 Divide each side by '21'. a = -1 Simplifying a = -1
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