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Simplifying -7a + 3(1 + -1a) + a = 0 -7a + (1 * 3 + -1a * 3) + a = 0 -7a + (3 + -3a) + a = 0 Reorder the terms: 3 + -7a + -3a + a = 0 Combine like terms: -7a + -3a = -10a 3 + -10a + a = 0 Combine like terms: -10a + a = -9a 3 + -9a = 0 Solving 3 + -9a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -9a = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -9a = 0 + -3 -9a = 0 + -3 Combine like terms: 0 + -3 = -3 -9a = -3 Divide each side by '-9'. a = 0.3333333333 Simplifying a = 0.3333333333
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