$w^2-28w+139$
$8+\left(-4\right)\cdot7-3+5^2$
$y'\:=\:4y\:+\:x^2\:+\:9$
$8m^2-2m-1$
$x^2-24=0$
$5^{-3x-1}=25$
$3c^3\cdot5$
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