$3,75+3,125+2,5$
$x^2+4x-7$
$\frac{16x^{2}-9}{2x+5\right)\left(4x+3\right)}$
$y'+y\:\tan\left(x\right)=0$
$\frac{x-1}{4}<\frac{x+4}{3}-\frac{x-5}{2}$
$-7y-6y^3+2y+4y^3-5-1-2y^3$
$\int\left(e^{3x}\sqrt{9+e^x}\right)dx$
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