Solve for b
b=28
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\frac{3\sqrt{b}}{3}=\frac{6\sqrt{7}}{3}
Divide both sides by 3.
\sqrt{b}=\frac{6\sqrt{7}}{3}
Dividing by 3 undoes the multiplication by 3.
\sqrt{b}=2\sqrt{7}
Divide 6\sqrt{7} by 3.
b=28
Square both sides of the equation.
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