$\int_{-1}^0\left(\frac{1}{x^4}\right)dx$
$x+0.8\left(x+0.2\right)$
$\left(x^{10}+10y^2\right)^2$
$n^{4}-49$
$\left(x+y-z\right)\left(x-y-z\right)-\left(x-z\right)^2$
$\int\sin^7dx$
$12x-6y=36$
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