x(3y+1)=8
x=8/3y+1
3y×(8/3y+1)+y=7
(24y/3y+1)+y=7
(24y/3y+1)+(3y^2+y/3y+1)-(21y+7/3y+1)=0
3y^2+4y-7/3y+1=0
D=16+84=100
y1=-4-10/6=-7/3
y2=-4+10/6=1
x1=8/3+1=2
x2=8/3×(-7/3)+1=-8/6=-4/3
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x(3y+1)=8
x=8/3y+1
3y×(8/3y+1)+y=7
(24y/3y+1)+y=7
(24y/3y+1)+(3y^2+y/3y+1)-(21y+7/3y+1)=0
3y^2+4y-7/3y+1=0
D=16+84=100
y1=-4-10/6=-7/3
y2=-4+10/6=1
x1=8/3+1=2
x2=8/3×(-7/3)+1=-8/6=-4/3