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Simplifying 7d + 3a + 12 = 0 Reorder the terms: 12 + 3a + 7d = 0 Solving 12 + 3a + 7d = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + 3a + -12 + 7d = 0 + -12 Reorder the terms: 12 + -12 + 3a + 7d = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 3a + 7d = 0 + -12 3a + 7d = 0 + -12 Combine like terms: 0 + -12 = -12 3a + 7d = -12 Add '-7d' to each side of the equation. 3a + 7d + -7d = -12 + -7d Combine like terms: 7d + -7d = 0 3a + 0 = -12 + -7d 3a = -12 + -7d Divide each side by '3'. a = -4 + -2.333333333d Simplifying a = -4 + -2.333333333d
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