$49x^2+9y^2+294x-180y-423=0$
$\int\:\frac{3x\sqrt{2x^2+9}}{5}dx$
$49x^2-49y^2$
$3a\:+\:b\:-\:5\:+\:4a\:-3b$
$3ab^2-a^2b^3+6ab^3$
$\frac{d^2y}{dx^2}\:y=-2x^6+5$
$18y^{2}+15y-18$
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