$-3x+5y=27$
$\frac{4}{3}-3x<-15$
$x-6>21-8x$
$\lim_{x\to0}\frac{5x^2-x}{\sin\left(x\right)}$
$\frac{\sin\left(90+a\right)+\cos\left(180+a\right)\cdot\sin\left(-a\right)}{\sin\left(90\right)-\cos\left(90+a\right)}$
$1023\cdot1$
$\lim_{x\to\infty}\left(\frac{x}{e^{2x}}\right)$
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