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Simplifying 7a + 14d = 21 Solving 7a + 14d = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-14d' to each side of the equation. 7a + 14d + -14d = 21 + -14d Combine like terms: 14d + -14d = 0 7a + 0 = 21 + -14d 7a = 21 + -14d Divide each side by '7'. a = 3 + -2d Simplifying a = 3 + -2d
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