$-2\cdot34$
$2x^4y^{-1}\cdot\left(x^{-2}y^{-5}\right)^4$
$\left(3a-2b+4c-d\right)-\left(2a+b-3c-d\right)$
$2x-8=30$
$x-2>5$
$x-y^2=0$
$9a-3a+4$
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