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