$6x^2y-9xy+3$
$3x+1+4x+2+x-5$
$\left(\frac{2}{5}a^2+3b\right)\left(\frac{2}{5}a^2-3b\right)$
$\frac{5a^{-2}}{5a^{-3}}$
$1+4+1-7$
$m^2+m-3\cdot m^2+m-3$
$\left(2\sin\left(x\right)^2+3\sin\left(x\right)\right)$
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