$6y^{2}-5y-2$
$\left(x+y\right)\left(a+b-1\right)$
$\left(-4x-5y+z\right)+\left(2x-y-2z\right)$
$- 1 - [ - 3 - 2 + ( - 4 ) ]$
$8^3-2^3$
$\left(3y^7-7x\right)^2$
$-5020-2320$
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