$x^2-x+49$
$3x^2+2xm;\:x=6;\:m=3$
$-6x^2y^2+x^2y^2$
$x^{36}+1\cdot x^2+1$
$\left(7+6^1\right)$
$-16\:+\:-728$
$\left(e^x+1\right)^2e^x$
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