$16\:x^2\:+\:7y^2\:-\:3\:-25x^2-1-12y^2$
$2x+3y-5x-9y+8xy-2x$
$\left(2a+3b\right)+\left(2a-3b\right)$
$\:9x+72$
$18\:+\:8\:+2$
$\int\frac{-1se^s+1}{-2\:\:\:s}ds$
$d^2y-d\left(3y\right)-4y=3x^2+2$
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