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x³+x²-9x-9=0
x²(x+1)-9(x+1)=0
(x²-9)(x+1)=0
(x-3)(x+3)(x+1)=0
x-3=0 x+3=0 x+1=0
x=3 x=-3 x=-1
============================
3x-x=8
2x=8
x=4
================
(5-2x)(5+2x)=0
(5-2x)=0 5+2x=0
-2x=-5 /:-2 2x=-5 /2
x=5/2 x=-5/2
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x³+x²-9x-9=0
x²(x+1)-9(x+1)=0
(x²-9)(x+1)=0
(x-3)(x+3)(x+1)=0
x-3=0 x+3=0 x+1=0
x=3 x=-3 x=-1
============================
3x-x=8
2x=8
x=4
================
(5-2x)(5+2x)=0
(5-2x)=0 5+2x=0
-2x=-5 /:-2 2x=-5 /2
x=5/2 x=-5/2