$x+2y+3z=9$
$\lim_{x\to+\infty}\sqrt{x+5}-\sqrt{x}$
$-3m\cdot5m^4-3m^3+6m-3$
$75-49-32+92+18-20$
$\frac{\left(x-3\right)\left(x+1\right)}{\left(x-3\right)}$
$2x^2+2x+3=0$
$\int ye^{2y}dy$
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