$7x-8y+5w-8x+9y-13w+83$
$-2csc\left(x\right)+2=0$
$a^2+4a+a$
$\frac{x^2-25}{x+5x}$
$6ad+3f$
$81\:x\:5$
$\frac{1}{2x}+\frac{5}{4}=\frac{3}{x}$
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