(3b^3-3b)/(b^2+7b+6)=0
3b^3-3b=0
b=0
3b^3=3b
b^2=1
b=1
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(3b^3-3b)/(b^2+7b+6)=0
3b^3-3b=0
b=0
3b^3=3b
b^2=1
b=1
18-b^2/(4*2)=0
18-b^2/8=0
b^2/8=18
b^2=18*8
b^2=144
b=12 или b=-12
для b=12 : x=-12/4=-3
для b=-12 :x=-(-12)/4=3