$7+3x+5x-2+7+3x+5x-2$
$\frac{4x^4+5x}{5x-2}$
$4\cdot\left(-3\right)\cdot5\cdot3\left(-4\right)\cdot\left(-1\right)$
$9+x=11$
$\left(y+1\right)dy=xdx$
$3sec^2x\:-\:2tan^{2\:}x\:-\:4\:=\:0\:$
$4\sqrt{3}-4i$
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