$\lim_{x\to7}\left(\frac{3x-\sqrt{x^2+8}}{2x-\sqrt{x^2+3}}\right)$
$1+\left(i-1\right)\frac{3}{5}+1+\frac{3i}{5}$
$4x^2y^2+5x^3y^3-3x^2y^2+8x^3y^3$
$5n+4+9n-2$
$-x+x+1$
$2x^2+8x\:+3=0$
$log\left(x-4\right)+logx=log5$
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