$2r-9\ge-6$
$x+6=20$
$\frac{\left(x^3-2x^2-4x-8\right)}{x-2}$
$5n+4\ge6n-5$
$\left(4t^3+5u^2\right)^2$
$\left(2a+3y\right)^2$
$dr\cdot sen\:x=2\cdot r\cdot cos\:x\cdot dx$
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