$5b+15=2b-6$
$x^2-25x-24$
$\int99dx$
$y''-6y'+14y=0$
$\left(2m^x+4n^x\right)^2$
$\cos^4y-2\cos^2y+1$
$a^2x-2a^2y-ax^2+2axy\:$
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