$a+b-1=12$
$\frac{dy}{dx}=3\left(x^2+7x\right)^{-5}$
$\frac{6x^3-3x^2-21x-11}{3x+3}$
$35,98+35,98$
$6.80+7.7$
$\left(7x^3y^3z^2-9\right)\left(7x^3y^3z^2+9\right)$
$x^2-12x+121$
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