$\left(x+1\right)\:y'\left(x\right)\:+\:y\left(x\right)\:=\:x$
$3.4ab-5.6ab$
$-100+\infty$
$x^2\le-5x-6$
$\int\frac{\left(5x-23\right)}{\left(x^2-9x+20\right)}dx$
$-7a+11b-8a-1a$
$4x^2+\left[-\left(x^2-xy\right)+\left(-3y^2+2xy\right)-\left(3x^2+y^2\right)\right]$
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