$\left(x-50\right)\left(a-20\right)$
$1.5\cdot10^7+2.7\cdot10^9$
$\int\frac{t^4+3t^3+t^2+3}{t^2+1}dt$
$\frac{1}{t}=\frac{v'}{-nv}$
$-x^4+5x^2-3x-1-5x^4+3x^3-x^2-2x+3$
$x2+7x+9=0$
$6m-9n+21nx-14mx$
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