$-5\cdot3+0\cdot2$
$\left(3^8^{-5}\right)\left(3^{-2}\right)$
$9-x^2=0$
$x^2+12=48$
$36\:-\:\left(-15\right)\:+\:\left(-20\right)\:-\left(-11\right)\:$
$4a^2-\left(2b+3\right)^2$
$4x-2x-x^2$
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