Solve {l}{a_{n}=43+{(n-1)}*{(-3)}}{a_{82}=43+{(82-1)}*{(-3)}}{a=43+{(81)}*{(-3)}}{b=43+{(-243)}}{text{Solvefor}c,dtext{where}}{c=a}{d=b}

$$\left. \begin{array} { l } { a_{n} = 43 + {(n - 1)} \cdot {(-3)} }\\ { a_{82} = 43 + {(82 - 1)} \cdot {(-3)} }\\ { a = 43 + {(81)} \cdot {(-3)} }\\ { b = 43 + {(-243)} }\\ { \text{Solve for } c,d \text{ where} } \\ { c = a }\\ { d = b } \end{array} \right.$$

Solve for a_n, n, a_82, a, b, c, d

$$c=-200$$

$$d=-200$$