$\left(2x\:+\:2\right)\:-\:\left(3x\:+\:11\right)$
$\left(ax-by\right)^2-\left(ay-bx\right)^2$
$2sen^2\left(x\right)-4sen\left(x\right)+1=0.5$
$\int_0^{\infty}\left(e^{1-x}\right)dx$
$3x^{2}+6x=5$
$\int\left(7x^6+8x^3-1\right)dx$
$x^{2\:}-14x-49$
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