$x+y+x-y+z+y-z$
$3x\:+\:2x\:$
$6a^2y+12by$
$\int^4\sqrt{x}\left(x+2\right)dx$
$\left(45.-12\right)\left(-38.4\right)$
$\left(x^2y^3\right)^7$
$2k^{4}-2m^{4}$
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