a=-10;
b=10;
n=0;
while b-a>eps
t=(a+b)/2;
n=n+1;
if 4*t^2+3*t-6==0
break;
elseif (4*a^2+3*a-6)*(4*t^2+3*t-6)>0
a=t;
else b=t;
end;
end;
x=t