$52+8-3+4+2-1$
$\frac{2x^2-4x+10}{x+1}$
$4x^2-2x-30$
$\left(4^6\cdot4^4\cdot4^2\right)$
$\frac{-3^7}{-3^4}$
$\left(12c-10d\right)^2$
$\:2^2+234+4^2$
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