$3x+2y=50$
$9x-4m+m-6x+5m$
$3x^2y-2^3\left(3x^2\right)$
$\left(20+x^2\right)^2$
$\left(2+n^2\right)^2$
$x\left(2x-3\right)\left(3x+4\right)$
$\left(4x^4-2y^3+4z^2\right)^2$
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