$$( \frac{ 1 }{ 2 } + \frac{ 5 }{ 8 } - \frac{ 3 }{ 5 } { x }^{ 2 }$$
$\frac{3\left(15-8x^{2}\right)}{40}$
$$\frac{45-24x^{2}}{40}$$
$$-24x^{2}+45$$
$$3\left(-8x^{2}+15\right)$$
$$\frac{3\left(-8x^{2}+15\right)}{40}$$
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$-\frac{3x^{2}}{5}+\frac{9}{8}$
$$\frac{9}{8}-\frac{3}{5}x^{2}$$
