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Simplifying a + (n + -4) * d = 1 Reorder the terms: a + (-4 + n) * d = 1 Reorder the terms for easier multiplication: a + d(-4 + n) = 1 a + (-4 * d + n * d) = 1 a + (-4d + dn) = 1 Solving a + -4d + dn = 1 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '4d' to each side of the equation. a + -4d + 4d + dn = 1 + 4d Combine like terms: -4d + 4d = 0 a + 0 + dn = 1 + 4d a + dn = 1 + 4d Add '-1dn' to each side of the equation. a + dn + -1dn = 1 + 4d + -1dn Combine like terms: dn + -1dn = 0 a + 0 = 1 + 4d + -1dn a = 1 + 4d + -1dn Simplifying a = 1 + 4d + -1dn
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