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Simplifying d + 7a + -7 = 9 Reorder the terms: -7 + 7a + d = 9 Solving -7 + 7a + d = 9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7a + 7 + d = 9 + 7 Reorder the terms: -7 + 7 + 7a + d = 9 + 7 Combine like terms: -7 + 7 = 0 0 + 7a + d = 9 + 7 7a + d = 9 + 7 Combine like terms: 9 + 7 = 16 7a + d = 16 Add '-1d' to each side of the equation. 7a + d + -1d = 16 + -1d Combine like terms: d + -1d = 0 7a + 0 = 16 + -1d 7a = 16 + -1d Divide each side by '7'. a = 2.285714286 + -0.1428571429d Simplifying a = 2.285714286 + -0.1428571429d
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