$-15x^2+120=0$
$1,4x-2,8y=1$
$3\sqrt{252}$
$\left(1+2\tan\:\left(x\right)\right)^2\:$
$10^{x+y}=5x$
$10y^2+\:6y+\:10.9\:=\:0$
$\frac{1}{2}a\cdot3$
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