z=6*e^{i*118/360}
$\frac{x^2+5x+6}{x^2+11x+24}$
6*e^{i*118/360}
7x-3y=15
2x+3y=12
$\frac{x^3+9x^2}{2x}$ × $\frac{x^2-14x+45}{x^2-81}$
e^x.(y-3(e^x+1)^2)dx+(e^x+1)^2dy
e^x(y-3(e^x+1)^2)dx+(e^x+1)^2dy
x^2=4xy
-1/4-2/3
3x+2y=22
x-2y=2
