/**
 * Solve an equation, up to cubic equation ax^3 + bx^2 + cx + d = 0
 *
 * @param a x^3
 * @param b x^2
 * @param c x
 * @param d constant
 * @returns solutions, real roots only
 * @requires Decimal
 */
export declare function solveEquation(a: Decimal, b: Decimal, c: Decimal, d: Decimal): Decimal[];
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