$4+7+5+6+8$
$4y^2-9x^2-36z=0$
$\frac{64}{-2}$
$\left(4-8n\right)^2$
$a+b+a-b-2a+b$
$\left(x+y\right)\left(x-y\right)\left(x^2+y^2\right)y^2$
$-8x>16$
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