$\left(-3\right)-\left(+2\right)-\left(-1\right)+\left(-5\right)$
$15^2+3-8$
$112x^3-175x$
$2x\left(x+4y\right)$
$\left[a-b\right]^2-\left[a+b\right]^2$
$\left(2a-5\right)\left(a+3\right)$
$-12+-10+-7+-2+4+9+11+9+4+-3+-8+-12$
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