$x^2-0.5x-1.5=0$
$\frac{cos\:t\:}{1\:-\:sin\:t}=\frac{1\:+\:sin\:t}{cos\:t}$
$4x^2-19x+6=0$
$9x\\:-\\:4\\:=\\:7x\\:+\\:8$
$x-6\sqrt{x^2}+5x-66$
$\left(7y\:+\:8z\right)\left(7y\:-\:8z\right)$
$-799-842$
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