$4z+8z$
$b^2-20b+100$
$3x-6<6x+3$
$m-5-5m+4$
$-84-23-90+54-44$
$\frac{d^2}{dx^2}\left(x^3-y^3=10\right)$
$2+\left(5-20\right)-\left(-3-9\right)+10$
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