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\left(2x+1\right)^{2}=ax
Multiply both sides of the equation by \left(2x+1\right)^{2}.
4x^{2}+4x+1=ax
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+1\right)^{2}.
ax=4x^{2}+4x+1
Swap sides so that all variable terms are on the left hand side.
xa=4x^{2}+4x+1
The equation is in standard form.
\frac{xa}{x}=\frac{\left(2x+1\right)^{2}}{x}
Divide both sides by x.
a=\frac{\left(2x+1\right)^{2}}{x}
Dividing by x undoes the multiplication by x.