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Simplifying 9(a + -1) + 3(a + -1) + -2 = 0 Reorder the terms: 9(-1 + a) + 3(a + -1) + -2 = 0 (-1 * 9 + a * 9) + 3(a + -1) + -2 = 0 (-9 + 9a) + 3(a + -1) + -2 = 0 Reorder the terms: -9 + 9a + 3(-1 + a) + -2 = 0 -9 + 9a + (-1 * 3 + a * 3) + -2 = 0 -9 + 9a + (-3 + 3a) + -2 = 0 Reorder the terms: -9 + -3 + -2 + 9a + 3a = 0 Combine like terms: -9 + -3 = -12 -12 + -2 + 9a + 3a = 0 Combine like terms: -12 + -2 = -14 -14 + 9a + 3a = 0 Combine like terms: 9a + 3a = 12a -14 + 12a = 0 Solving -14 + 12a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + 12a = 0 + 14 Combine like terms: -14 + 14 = 0 0 + 12a = 0 + 14 12a = 0 + 14 Combine like terms: 0 + 14 = 14 12a = 14 Divide each side by '12'. a = 1.166666667 Simplifying a = 1.166666667
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