$x^2-10x+19=0$
$\left(+6\right)\:-\:\left(+8\right)\:-\:\left(-\:4\right)\:+\:\left(-\:2\right)$
$2x-3y-x-y$
$-x^3+\:2x\left(x-x^2\right)$
$\int sen\left(ax\right)\cos\left(ax\right)dx$
$+4-1+10$
$2x^3-x$
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