$-3x^2-2x+5+4x^2-7x+6$
$xe^{xa^2}^{+1}$
$1\left(2+5\right)$
$\left(3x-\frac{b}{2}b\right)$
$\frac{2555\le155}{x+1}=\frac{3}{x-1}$
$\left(-y+4\right)^3$
$x^2-12x+27=0$
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