$3x^4-x^2-5x-7$
$x^2+bx+x$
$\frac{x^3-3x^2+55}{x+5}$
$\int\frac{3+2x}{\sqrt{4-5x}}dx$
$4x-x\cdot4x\cdot3x$
$\left(x^2+4x-1b\right)\left(x-1\right)$
$\frac{3-2x}{x+2}=3x$
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