Х^+9х=0 , х^+16х=0, х^-5=0 , х^-7=0

1) x^+9x=0
x±9x=0
x10=0
x={0,0,0,0,0,0,0,0,0,0,
2) x^-5=0
1/x5=0
x={}
3) x^16x=0
x+16x=0
x17=0
x={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,}
4) x^-7=0
x-7=0
1/x7=0x={}