$x^2+18x-7=0$
$49+2+3-2-3-1$
$w^2-40=3w$
$\frac{6a^4+5a^3-1}{2a^2+a-1}$
$x^2+3x+5$
$\int-4\sin\left(x^2\right)dx$
$\sqrt{1.5}$
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