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Simplifying 4x + a + d + 7 = 4n Reorder the terms: 7 + a + d + 4x = 4n Solving 7 + a + d + 4x = 4n 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 + a + d + -7 + 4x = -7 + 4n Reorder the terms: 7 + -7 + a + d + 4x = -7 + 4n Combine like terms: 7 + -7 = 0 0 + a + d + 4x = -7 + 4n a + d + 4x = -7 + 4n Add '-1d' to each side of the equation. a + d + -1d + 4x = -7 + -1d + 4n Combine like terms: d + -1d = 0 a + 0 + 4x = -7 + -1d + 4n a + 4x = -7 + -1d + 4n Add '-4x' to each side of the equation. a + 4x + -4x = -7 + -1d + 4n + -4x Combine like terms: 4x + -4x = 0 a + 0 = -7 + -1d + 4n + -4x a = -7 + -1d + 4n + -4x Simplifying a = -7 + -1d + 4n + -4x
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