$99\cdot80$
$tan\left(45-x\right)=\frac{1-tanx}{1+tanx}$
$\sin\frac{x}{2}=0$
$7y\:+\:5\:+\:3\:-\:y$
$y^2\frac{dy}{dx}+x^3=0$
$9-2x+7$
$-1076-850$
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