7b+(2a-7b²)/b=(7b*b+2a-7b²)/b=(7b²+2a-7b²)/b=2a/b=
=2*3√3/√12=6√3/√(4*3)=6√3/(2*√3)=3.
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7b+(2a-7b²)/b=(7b*b+2a-7b²)/b=(7b²+2a-7b²)/b=2a/b=
=2*3√3/√12=6√3/√(4*3)=6√3/(2*√3)=3.