(x+2)(x-2)(x+1)=0⇒x₁=-2;x₂=2;x₃=-1
-3х+2=2х+7
-3x-2x=7-2
-5x=5
x=-5/5
x=-1
_____________
3х^2у-9ху^2=3xy(x-3y)
X-100%
y-135%
x-y=7
x=100y/135
100y/135-y=7
100y-135y=945
35y=945
y=27
x=7+y=34
X/(2+3*x)+5/(2-3*x)=5*(2+3*x)/((2-3*x)*(2+3*x)),
x/(2+3*x)+5/(2-3*x)=5/(2-3*x),
x/(2+3*x)=0,
x=0
Ответ: x=0.