$2\tan^2x-3=3$
$1\cdot6.9$
$4x^2=\frac{-2x+4}{3}$
$49x^2+14xy+y^2$
$b^3+b^3+b^3+b$
$6+7+4-9+2-3+10$
$4r^2+5=0$
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