$\left(\:x\:-\:15\:\right)\left(\:x\:-\:7\:\right)\:$
$\left(\frac{1}{5}+y\right)\left(\frac{1}{5}-y\right)$
$5-2.1s+17s$
$90.3-7.54$
$\frac{4x^7-2x^6+3x-2}{x+2}$
$34.705+3.21+5.3$
$3\left(x-y\right)-2\left(y-x\right)\:$
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