2)
(3x+1)*2=2x*2+1
x=0 ; x=-6/7
6
3)x(x+8)=9
x=1 ; x=-9
4)[tex]8x^{2}=x^{2}+7\\x=1 \\x=-1[/tex]
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2)
(3x+1)*2=2x*2+1
x=0 ; x=-6/7
6
3)x(x+8)=9
x=1 ; x=-9
4)[tex]8x^{2}=x^{2}+7\\x=1 \\x=-1[/tex]