$\:j+j+2kj+j+2k$
$8\cdot\left|\left(-5\right)-\left(-9\right)+6-10\right|$
$20xy^2-5xy+10x^2y-5x^2y^2$
$\left(5x+3y\right)^2-\left(5x-3y\right)^2$
$20x^2-11x-4=0$
$\left(2m^x-3n^y\right)^2$
$\int_0^1\left(e^{-sx}\left(1-x\right)\right)dx$
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