$\left(30+12\right)\left(3^2-4^2\right)$
$72y+43y+24x+32y+21x+12x$
$\sqrt[5]{-243x^{5}y^{15}}$
$-8x=40$
$1\cdot\:4\cdot\:1+4$
$b^2-2b+1$
$x^2+6x-8=0$
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