$-4+6+\left(\:\left(-8:2+1.-3\right)-5\right)$
$4.64\cdot30$
$\left(14-x-y\right)^2$
$m^2-18m+82$
$x^2-z^2+3x+2z+4=y$
$\left(m^2+12+36\right)-\left(m^2-36\right)$
$x^2+2x-4=0$
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