restart;
eq1 := xdot = (xk - xk1)/dt;
eq2 := xdot2 = (xk - 2*xk1 + xk2)/dt^2;
eq3 := c*xdot + k*xk + m*xdot2 = F;
sol := solve({eq1, eq2, eq3}, xk);
What am I missing here? Ty
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Simple solve on equations
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