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Simplifying a + (n + -1) * d = 143 Reorder the terms: a + (-1 + n) * d = 143 Reorder the terms for easier multiplication: a + d(-1 + n) = 143 a + (-1 * d + n * d) = 143 a + (-1d + dn) = 143 Solving a + -1d + dn = 143 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'd' to each side of the equation. a + -1d + d + dn = 143 + d Combine like terms: -1d + d = 0 a + 0 + dn = 143 + d a + dn = 143 + d Add '-1dn' to each side of the equation. a + dn + -1dn = 143 + d + -1dn Combine like terms: dn + -1dn = 0 a + 0 = 143 + d + -1dn a = 143 + d + -1dn Simplifying a = 143 + d + -1dn
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