$-7b+7b$
$455\cdot60$
$344-75$
$\left(x^a+y^b\right)\left(x^2-y^b\right)$
$0\left(-1\right)+3\left(0\right)+\left(-1\right)\left(3\right)$
$11a-8a-2a-3a+5a$
$-10\left(-17\right)\left(-2\right)$
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