$35y^3-90y^2-45y$
$\left(2a-4b\right)^2$
$30+60x^2+25x^4$
$\frac{dy}{dx}-2y=4$
$8u^7-28u^6+20u^5$
$\left(+63\right)\left(+4\right)$
$4x=7.1$
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