$$(8b-3-7 { b }^{ 3 } )+(-1-6b-5 { b }^{ 3 } )$$
$2\left(-6b^{3}+b-2\right)$
$$8b-4-7b^{3}-6b-5b^{3}$$
$$2b-4-7b^{3}-5b^{3}$$
$$2b-4-12b^{3}$$
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$$-12b^{3}+2b-4$$
$$2\left(-6b^{3}+b-2\right)$$
