$2x-7x$
$4x^2-64x+5$
$senx\:=\:0.2$
$3x^2\sqrt{2y^4}$
$\left(3x+2\right)\:\:\:+\:\:\left(3x+2\right)+\:\:\left(3x+2\right)+\left(3x+2\right)+\:\:\left(3x-2\right)\:+\:\:\:\left(3x-2\right)\:\:$
$\frac{1}{\left(y-m\right)\left(y-n\right)}$
$2 ^ { 2 x } + 20 - 9 \cdot 2 ^ { x } = 0$
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