$40+\:45+\:50+\:25$
$\lim_{h\to0}\left(\frac{\frac{2}{\sqrt{x+h}}-\frac{2}{\sqrt{x}}}{h}\right)$
$\left(4x-5y\right)\left(16x^2+20xy+25y^2\right)$
$x+\frac{1}{y}=5$
$3a-4ba-\left(2a-3b\right)-5-\left[2b-\left(4a-3b\right)-a\right]$
$-8+\left(+5-9\right)-6$
$x+9=25$
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