$b+b^3$
$3\cdot[5+2\cdot\left(-3+6\times9\right)]+1$
$2x=4+y$
$z\cdot3=69$
$-\left(\frac{2}{3}x+\frac{4}{7}\right)^{2}$
$\left\{x'=x+2y\right\}$
$-22\:-\:3-2\:+1$
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