$4x^2-4x-16$
$2x^2+x^2-4x^2+x$
$( 3 a + 1 ) ^ { 2 }$
$2x+1\cdot2x-3$
$\left(+4\right)-\left(+8\right)-\left(-3\right)+\left(+2\right)-\left(-5\right)$
$\left(a^2+2a+11\right)\left(-a^2-a-1\right)$
$x^4=x$
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