$2x-y+z=2$
$- 3 x ^ { 2 } + 6 x + 1 = 0$
$4x+4x+4x^2+5$
$x^2-6x+6^2$
$\left(x^{\frac{1}{2}-1}\right)^9$
$\frac{a^2+2a-3}{a+4}$
$a^2b^4-c^2$
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