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Simplifying 7a + 2a + -1 = 17 Reorder the terms: -1 + 7a + 2a = 17 Combine like terms: 7a + 2a = 9a -1 + 9a = 17 Solving -1 + 9a = 17 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 + 9a = 17 + 1 Combine like terms: -1 + 1 = 0 0 + 9a = 17 + 1 9a = 17 + 1 Combine like terms: 17 + 1 = 18 9a = 18 Divide each side by '9'. a = 2 Simplifying a = 2
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