$x^2-200x+100$
$3r-r=12$
$-5^2\:+-5^2\:+-5^2\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\left(2xy-5y^2\right)^2$
$x-6+3x<30$
$94+x=180$
$3\left(5y\right)$
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