$\left(+57\right).\left(+23\right)$
$x-2+x-2$
$\left(-40\right)-\left(-201\right)$
$3y-x-6y-i+12xy+4+xy$
$6x^0$
$4^{x+1}=8^{x+1}$
$-\frac{27}{-27}$
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