$-15=11-2x$
$xy^3.\left(\frac{2x}{y}\right)^2$
$4a^2b^2+32ab+64$
$24\:+\:s\:=\:47$
$-x+15x-4x+6x$
$9^2+8a+16$
$\left(x-\frac{1}{4}\right)^2$
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