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Simplifying 2a + -1 + 6a = -129 Reorder the terms: -1 + 2a + 6a = -129 Combine like terms: 2a + 6a = 8a -1 + 8a = -129 Solving -1 + 8a = -129 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 8a = -129 + 1 Combine like terms: -1 + 1 = 0 0 + 8a = -129 + 1 8a = -129 + 1 Combine like terms: -129 + 1 = -128 8a = -128 Divide each side by '8'. a = -16 Simplifying a = -16
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