$2x^2-1x=1$
$7\left(3x+6\right)-2x$
$-4.9-\:-2$
$\frac{22}{0.37}$
$0\cdot x^2\cdot\left(-3\right)$
$\frac{4x^3-7x+30}{x-1}$
$\left(x^2+3x\right)^4$
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