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Simplifying -2 + 7a + 9 + 1 = 0 Reorder the terms: -2 + 9 + 1 + 7a = 0 Combine like terms: -2 + 9 = 7 7 + 1 + 7a = 0 Combine like terms: 7 + 1 = 8 8 + 7a = 0 Solving 8 + 7a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 7a = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 7a = 0 + -8 7a = 0 + -8 Combine like terms: 0 + -8 = -8 7a = -8 Divide each side by '7'. a = -1.142857143 Simplifying a = -1.142857143
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