$$(5+\frac{3}{4}x)^{2}$$
$\frac{\left(3x+20\right)^{2}}{16}$
$$25+\frac{15}{2}x+\frac{9}{16}x^{2}$$
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$\frac{9x^{2}}{16}+\frac{15x}{2}+25$
