$125^3$
$2c-13a-7b-2c-13a-7b$
$8xy+12xz$
$\left(7x^2-4x^3\right)cos2x$
$x^2\cdot z''\left(x\right)-xy\cdot z''\left(y\right)=z-y$
$10w+40d+50f+60d+40f$
$2a\left(m+n\right)^2$
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