$4\cdot\left(-10\right)-6$
$12x-5x+8x-10x$
$10e^x+xe^x-2\left(9e^x+xe^x\right)+\left(8e^x+xe^x\right)=0$
$3xy^2+6xy+21x$
$8n^2-7n=-7$
$\int\left(2x+3^{-1}\right)^2dx$
$\int_0^{\frac{\pi}{3}}\left(\sec^22x\right)dx$
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