$\int\frac{1+6x+10x^2}{x^2\left(x+1\right)}dx$
$ax^2+a^2x^3-10a^2x;\:a=-3;\:x=4$
$2^1+4+9$
$9x^4-30x^3y+25xy$
$4x-2y$
$\left(6x^3-3xy^5\right)^2$
$300+-70+-80+500$
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