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16s + 4s = 20s
(4s + 1)(4s + 1) or (4s + 1)2
s2 + 4s - 32 = 0 What two factor of - 32 add up to 4? (s - 4)(s + 8) s = 4 ===
9s - 9
300 divided by 4 equals 75 !