$2 + x y = 1$
$\left(3x^5y^4\right)^2$
$2a+3a+3c+5a-2b+4c+5a+4c$
$4z^2+24zw+36w^2$
$144 \times 4 ^ { 4 } - 819 ^ { 4 } b ^ { 2 }$
$\frac{5x^2}{2}-3+1$
$2m+5m+2$
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