$7a^2-3a^2+6a-11$
$\left(3d^4-7e^3\right)^2$
$0.86^{11}$
$6ax+3a+1+2$
$x^2+15x+156$
$-4b+2b$
$\int_{-\infty}^{-64}\left(\frac{1}{1+x^2}\right)dx$
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