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Simplifying 7a + -2(a + -1) = 17 Reorder the terms: 7a + -2(-1 + a) = 17 7a + (-1 * -2 + a * -2) = 17 7a + (2 + -2a) = 17 Reorder the terms: 2 + 7a + -2a = 17 Combine like terms: 7a + -2a = 5a 2 + 5a = 17 Solving 2 + 5a = 17 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 5a = 17 + -2 Combine like terms: 2 + -2 = 0 0 + 5a = 17 + -2 5a = 17 + -2 Combine like terms: 17 + -2 = 15 5a = 15 Divide each side by '5'. a = 3 Simplifying a = 3
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