$-7.687\:-\:1.74$
$x^2-12x-9=0$
$\left(2x^2y-4m\right)^2$
$144 \times 4 ^ { 4 } - 819 ^ { 4 } b ^ { 2 }$
$2x-4+7x+3$
$\int4x^3e^{2x}dx$
$x+\left(x-y\right)2-\left|2x+y\right|^2$
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