$4ax^2\cdot3x^2-6x+7$
$4x^2-4x-35=0$
$\frac{x^2+6x+8}{x+3}$
$-\int\left(\frac{y}{x^2+y^2}\right)dx$
$2x+y=90$
$-3\cdot1+1$
$y=\ln\left(\sqrt{x^2-3}\right)$
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