$i^2+6i\cdot x+9x^2$
$12x^2yx\:+\:4xy^2z\:-\:8xyz^2$
$t\left(x^2+1\right)dt+x\left(t^2+1\right)dx=0$
$\left(12a-7b+4c\right)-\left(-13a-5b+4c\right)$
$36m^2-48mn+16n^2$
$\frac{5+y}{5}+\frac{5+y}{5}$
$uxu$
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