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Simplifying 9a + -7a + -1 = 19 Reorder the terms: -1 + 9a + -7a = 19 Combine like terms: 9a + -7a = 2a -1 + 2a = 19 Solving -1 + 2a = 19 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 + 2a = 19 + 1 Combine like terms: -1 + 1 = 0 0 + 2a = 19 + 1 2a = 19 + 1 Combine like terms: 19 + 1 = 20 2a = 20 Divide each side by '2'. a = 10 Simplifying a = 10
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