Solve:
a. the quadratic equation
b. the quadratic inequality
For example:
a.
"6x^2-7x+2=0"
"x=\\frac{7\\pm \\sqrt{49-48}}{12}"
"x_1=1\/2,\\ x_2=2\/3"
b.
"6x^2-7x+2<0"
"6x^2-7x+2=6(x-1\/2)(x-2\/3)=(2x-1)(3x-2)"
"(2x-1)(3x-2)<0"
"x\\isin (1\/2,2\/3)"
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