$4b^2-20b+25$
$walfram$
$\frac{1}{4}+4.6$
$5^3\cdot25$
$3\left(3x-2y\right)\:-7\left|\left(3x-2y\:-4x+7y\right)\:-2\left(2x-5y\right)\right|$
$\left(689\right)-\left(-59\right)$
$f^2+40-f^2$
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