$39-17,65$
$-2x^2-8x+5$
$-6-3\cdot\left(4-8-5+32\right)+21$
$49x^2-y^2$
$6\log\left(d\right)-3\log\left(f\right)$
$x^2+157x-60$
$2a+3b-5a+6b$
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