$-6+5-3+3-2+8-4+1$
$4\left(3y-2\right)^2-9\left(y-1\right)$
$x-18+x-2$
$\left(2y^3+x\right)\left(2y^3-x\right)$
$\sqrt{\left(x^2+4x+4\right)-\left(x^2-4x+4\right)}$
$\left(3mn+2m-5n\right)+\left(-3m+n-2mn\right)+\left(3n+m+5mn\right)$
$12\cdot4.3\cdot5$
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