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Simplifying 7a + -2(3a + 1) + -9 = 0 Reorder the terms: 7a + -2(1 + 3a) + -9 = 0 7a + (1 * -2 + 3a * -2) + -9 = 0 7a + (-2 + -6a) + -9 = 0 Reorder the terms: -2 + -9 + 7a + -6a = 0 Combine like terms: -2 + -9 = -11 -11 + 7a + -6a = 0 Combine like terms: 7a + -6a = 1a -11 + 1a = 0 Solving -11 + 1a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + 1a = 0 + 11 Combine like terms: -11 + 11 = 0 0 + 1a = 0 + 11 1a = 0 + 11 Combine like terms: 0 + 11 = 11 1a = 11 Divide each side by '1'. a = 11 Simplifying a = 11
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