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Simplifying
b(15 + -3b)(15 + 5b)

Multiply (15 + -3b) * (15 + 5b)
b(15(15 + 5b) + -3b * (15 + 5b))
b((15 * 15 + 5b * 15) + -3b * (15 + 5b))
b((225 + 75b) + -3b * (15 + 5b))
b(225 + 75b + (15 * -3b + 5b * -3b))
b(225 + 75b + (-45b + -15b2))

Combine like terms: 75b + -45b = 30b
b(225 + 30b + -15b2)
(225 * b + 30b * b + -15b2 * b)
(225b + 30b2 + -15b3)
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