$4x+4<9x+9$
$-1\cdot4\cdot\left(-1\right)$
$x^2+13x+45$
$\int10x+100\cdot e^{-0.1x-1}dx$
$9+1024+16+1+64$
$\left(2x-xt\right)h$
$-0.5x=1.1$
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