$7^2-20$
$u^2+\frac{7u}{2}-2$
$2+\frac{1}{x-1}$
$5x^2-3y;\:x=1;\:y=2$
$a2+2a-35$
$\frac{dy}{dx}=-2asin2x+2bcos2x$
$144 p ^ { 2 } - 900 q ^ { 2 }$
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