$5x^4-3x^3+2x^2+6x$
$2x^2+7+6x-1-7x-6x^2$
$y^6+7y^3-8$
$xa+xb-xc$
$\int-2\cdot sen\left(2x\right)$
$x\:-\:2y\:+\:4\:=\:0$
$y^2-3y+\frac{9}{1}$
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