a^2 - 4/a - 3 = 0 solve quadritcally
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A^2-4/2-3=0
a^3-4-3a=0
a^3-3a=4
a=4 or a^2-3=4
a^2=7
a=root 7
a^3-4-3a=0
a^3-3a=4
a=4 or a^2-3=4
a^2=7
a=root 7
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