$-3w+3\ge18$
$\frac{16-b^4}{2+b}$
$resolver\:\:3a^5+3a^3+3a$
$x^2<3+18x$
$5x-8x+x-6x+21$
$\int\frac{5x+15}{x^2+15x+50}dx$
$x-1+-12x+10$
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