$\int\frac{5x+7}{\left(x^2+2x-3\right)}dx$
$3a\left(4a-7\right)$
$\frac{9}{16}x^2+\frac{9}{16}y^2=1$
$4+2-x$
$-11a^4b+2a^2b^3+8a^3b^2-4ab^4a^5+b$
$6x^2+51x+81=9x^2+81x+153$
$2y''\:+\:4y'\:+\:2y\:=\:0$
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