$x+-68=-129$
$7x^{2}+14=0$
$f\left(x\right)=x+5\text{y}g\left(x\right)=5-\frac{1}{5}x^{2}$
$xy'-10y^2=0$
$\lim_{x\to\infty}\left(\frac{\sin\left(x\right)^2}{x^2}\right)$
$30\::\:\left[\:\left(-\:12\:+\:9\right)\:-\:\left(3\:.\:3\:-12\::\:3\right)\:+\:2\right]\:+\:\left(\:-2\right)$
$\cos2x-\cos x=2$
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