$3b-2\left(2b+a\right)$
$c\left(7x-1\right)$
$2xydx+\left(x^2+1\right)dy=0$
$\left(3x^2-2y^2\right)\left(9x^4+6x^2y^2+4y^4\right)$
$\frac{3}{x}-\frac{3}{y}-2x$
$\left(\frac{2}{5}a^3-\frac{1}{2}a^2\right)^3$
$4tan^2x-8tanx+3=0$
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