y²+3x=7 x=(7-y²)/3y³+x=3 x=3-y³(7-y²)/3=3-y³3y³-y²-2=03y³-3y²+2y²-2=03y²(y-1)+2(y+1)(y-1)=0(y-1)(3y²+2y+2)=03y²+2y+2=3(y+ 1/3)...