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\sqrt{2}a-a=\frac{2}{3}b
Subtract a from both sides.
\left(\sqrt{2}-1\right)a=\frac{2}{3}b
Combine all terms containing a.
\left(\sqrt{2}-1\right)a=\frac{2b}{3}
The equation is in standard form.
\frac{\left(\sqrt{2}-1\right)a}{\sqrt{2}-1}=\frac{2b}{3\left(\sqrt{2}-1\right)}
Divide both sides by \sqrt{2}-1.
a=\frac{2b}{3\left(\sqrt{2}-1\right)}
Dividing by \sqrt{2}-1 undoes the multiplication by \sqrt{2}-1.
a=\frac{2\left(\sqrt{2}+1\right)b}{3}
Divide \frac{2b}{3} by \sqrt{2}-1.
a+\frac{2}{3}b=\sqrt{2}a
Swap sides so that all variable terms are on the left hand side.
\frac{2}{3}b=\sqrt{2}a-a
Subtract a from both sides.
\frac{\frac{2}{3}b}{\frac{2}{3}}=\frac{\left(\sqrt{2}-1\right)a}{\frac{2}{3}}
Divide both sides of the equation by \frac{2}{3}, which is the same as multiplying both sides by the reciprocal of the fraction.
b=\frac{\left(\sqrt{2}-1\right)a}{\frac{2}{3}}
Dividing by \frac{2}{3} undoes the multiplication by \frac{2}{3}.
b=\frac{3\left(\sqrt{2}-1\right)a}{2}
Divide a\left(\sqrt{2}-1\right) by \frac{2}{3} by multiplying a\left(\sqrt{2}-1\right) by the reciprocal of \frac{2}{3}.