$\left(7x-1\right)^2-\left(9x-2\right)^2$
$-8\:+\:-51\:+\:-16\:+\:-10\:+\:14\:=\:$
$49a^2-28ab^2+4b^4$
$\lim_{x\to0}\:\frac{4x^2-15}{4x+3}$
$2yz+3y-12z-15z+7yz-13y$
$\frac{3}{2}a+\frac{2}{4}b^n+\frac{1}{5}c^{2n}$
$8n-2\left(6n+5\right)$
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