$7 x ^ { 2 } + x 4 - y ^ { 2 } = 4$
$2x+1=x+2$
$\left(n-12\right)^2$
$\frac{d^2}{dx^2}\left(\frac{3x+9}{2-x}\right)$
$12b-12c-2c+10b$
$-9\:+\:7\:-\:-43$
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