$4x-3a+2y-5x+x+3a-y-y$
$\sin\left(x\right)-2tan\left(x\right)=0$
$2,5+1$
$\lim_{x\to\infty}\left(\frac{sin\left(x\right)}{x}\right)^{\frac{20}{x^2}}$
$15f-13g+5-4f-8g+9$
$\frac{5}{x\left(x+1\right)\cdot\:\left(x^2+6x+100\right)}$
$4x+34=-x+79$
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