$8x^2y:\:2x:\:2y$
$15-6\left(2-4x\right)-5x-2$
$-b-4b$
$\left(13k-h\right)^2$
$2m^3-6n^2+5n^2+3m$
$x-5-x^2-5-x-5$
$1.4\cdot10^6$
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