$\lim_{x\to0}\left(\frac{10}{x}-\frac{3}{senx}\right)$
$\left(2x-7\right)\left(x-7\right)$
$b-\sqrt[3]{5}-7\sqrt[3]{5}+\sqrt[3]{5}+10\sqrt[3]{5}$
$3a+2+4a$
$\frac{2x^4}{x^3}$
$400n^2-169m^2$
$\frac{\left(-1\right)^n}{n\cdot3^n}\cdot\left(x+5\right)^n$
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