$\:3\left(xy+yz+zx\right)$
$x+20=4x-4$
$\left(x^2-2x+2\right)-2x+1$
$1+-1+2+-2+3+-3$
$\left(x+5\right)\left(x-5\right)\left(x^2\right)$
$2sin2x\:\left(1-2sin^2x\right)$
$x^2+20x+19$
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